Mummification is usually associated with deliberate ritual practice, from the embalmers of ancient Egypt to the salt-packing techniques documented in historical funerary customs. But nature occasionally produces the same result on its own. Salt works as a preservative through two complementary mechanisms. First, it is strongly hygroscopic, drawing water out of tissue by osmosis and creating a desiccated state in which the chemical reactions of decay slow dramatically. Second, high salinity is antimicrobial: most of the bacteria that drive putrefaction cannot tolerate concentrated brine, so the microbial ecosystem that normally dismantles a corpse simply collapses. Deprived of both moisture and microbes, soft tissue can survive for months, years, or even millennia.

The archaeological record is full of proof. The most famous examples are the salt men of Chehrābād in northwestern Iran, miners who perished in collapses at the Douzlākh salt mine as early as the fourth century BC and were preserved so completely that ancient DNA, isotopic signatures of their diet, and even the fibers of their clothing have been recovered. Previous laboratory work, including experiments in which human tissue was deliberately mummified in salt, has confirmed how rapidly salt halts both microbial growth and DNA degradation. Yet despite this rich archaeological literature, no forensic scientist had ever documented a naturally salt-mummified body in a contemporary medico-legal context, until now.

The French case is unusual not only because it happened at all, but because of where it happened. Unlike the Iranian salt men, who were entombed in a dry, cool salt mine, this body was found in a warm, humid, anthropogenic saline environment, a human-made salt production setting in the Mediterranean south of France. The region has a seventy-year history of managed coastal salinas, shallow basins where seawater is evaporated to harvest salt, and abandoned sites where hypersaline water pools and crystallizes under the intense Provençal sun. Local geochemical studies of nearby lagoons such as Lavalduc have documented active precipitation of halite, the mineral form of sodium chloride, in and around these basins. It was in this evaporative, salt-saturated setting that the body lay undisturbed long enough for a crystalline shell to grow around it.

External examination revealed a completely desiccated body, brown and leathery in appearance, with the facial features and the morphology of the limbs and extremities remarkably preserved. That degree of anatomical integrity is forensically valuable: it allowed the team to attempt a biological profile of the deceased, the standard assessment of sex, age, and body characteristics that forms the first step toward identification. In many decomposed or skeletonized bodies, such profiling is severely compromised by tissue loss. Here, the salt had effectively frozen the external anatomy in place, demonstrating that natural mummification can paradoxically make a body more identifiable, not less.

Autopsy, however, told a more complicated story. Inside the leathery exterior, the researchers found extensive tissue desiccation consistent with prolonged exposure to a highly saline environment, but the preservation was strikingly uneven. Some regions showed classic mummified changes, while others displayed focal putrefactive alteration, including complete liquefaction of the brain. This hybrid pattern, in which desiccation and decay coexist in the same body, had not previously been described in the modern forensic literature. The authors attribute it to the specific dynamics of the anthropogenic saline setting: fluctuations in salinity, intermittent moisture, and ambient heat likely allowed pockets of decomposition to proceed before full desiccation took hold, producing a mosaic of preservation that contrasts with the uniform mummification seen in mine contexts.

The case also illustrates the hard limits of forensic science when preservation is this unusual. Toxicological analyses of visceral samples came back negative for drugs and toxic substances, ruling out chemical causes of death detectable in the preserved tissue. DNA analysis and fingerprint examination were both performed, but neither produced an identification. The failure is instructive. Even when tissue appears well preserved, the same osmotic and chemical stresses that stop decay can fragment genetic material in ways that defeat standard amplification, and desiccated skin often cannot yield usable friction ridge prints. For the identification effort, the team had to fall back on contextual and morphological evidence rather than laboratory confirmation.

Perhaps the most innovative part of the investigation was environmental. Rather than relying solely on the body itself, the researchers reconstructed the salinity dynamics, evaporation rates, and local climate conditions of the site, and used that reconstruction to support a tentative hypothesis about the post-mortem interval, the elapsed time since death. The logic is analogous to entomological dating, where insect development stages clock the interval, but here the clock is geochemical: the thickness of the salt crust, the rate at which brine evaporates under the regional climate, and the seasonal behavior of the saline basin together constrain how long the body must have lain there. The authors emphasize that this estimate is tentative, but the approach itself is a proof of concept for reading time from the environment in cases where conventional markers are absent.

The report arrives amid growing attention to what forensic scientists call complex bodies, remains whose preservation state falls outside the familiar categories of fresh, decomposed, skeletonized, burned, or water-immersed. Recent systematic reviews and procedural proposals have argued that such cases demand a multidisciplinary response, combining pathology, anthropology, radiology, genetics, toxicology, entomology, botany, and environmental science, guided by standardized on-site inspection protocols such as those developed by the European Council of Legal Medicine. The salt mummy of southern France is a textbook argument for that approach: no single discipline could have interpreted the body, but the combined evidence of morphology, chemistry, and environmental reconstruction extracted real forensic information from an apparently intractable case.

For the wider forensic community, the implications are twofold. First, investigators encountering desiccated remains in or near saline environments, from abandoned salinas to industrial brine facilities, should now consider natural salt mummification as a genuine possibility rather than a curiosity confined to archaeology. Second, the case expands the known range of environments capable of natural preservation into warm, humid, human-modified settings, which means the global geography of potential salt mummies is far larger than the arid mines and deserts of the archaeological record. As the authors conclude, environmental analysis and multidisciplinary investigation are essential tools for identification and post-mortem interval estimation in complex bodies, and this unique case, a man sealed in salt under the Mediterranean sun, may be only the first of its kind to surface.

Subject of Research: Natural salt mummification of human remains in a forensic context

Article Title: Natural salt mummification in a forensic context: a case report and environmental considerations

Article References: Delteil, C., Zuck, S., Capuani, C., Carballeira-Alvarez, A., Ardagna, Y., & Tuchtan, L. (2026). Natural salt mummification in a forensic context: a case report and environmental considerations. International Journal of Legal Medicine. https://doi.org/10.1007/s00414-026-04040-4

Image Credits: AI Generated

DOI: 10.1007/s00414-026-04040-4

Keywords: salt mummification, forensic pathology, mummification, post-mortem interval, forensic anthropology, decomposition, halite, saline environment, taphonomy, case report, DNA analysis, environmental forensics

The research, conducted at the Department of Forensic Medicine in Hradec Králové in the Czech Republic, is the first systematic, statistically validated investigation of reactive splenic contraction in human hypothermia deaths. The finding itself is not new to physiology. The spleen acts as a rapidly mobilizable blood reservoir, capable of sequestering up to 200 to 250 milliliters of densely packed erythrocytes. When the sympathetic nervous system fires—during exercise, hypoxia, hemorrhage, or severe stress—the splenic capsule and vessels contract, squeezing stored red blood cells into the circulation and boosting oxygen-carrying capacity within moments. What had never been done before was to rigorously test whether this dramatic physiological response leaves a recognizable and diagnostically reliable footprint at autopsy in people who died of hypothermia.

The study team, led by Lenka Zátopková and Štěpánka Pohlová Kučerová together with senior author Petr Hejna, examined 54 fatalities attributed to accidental hypothermia and compared them against 170 randomly selected control cases representing both natural and non-natural deaths, including heart failure, cardiopulmonary failure, hanging, and suffocation. The researchers defined reactive splenic contraction by a strict macroscopic triad: an apparent reduction in splenic volume or weight relative to the decedent’s body size, wrinkling of the splenic capsule, and anemization of the red pulp on the cut surface, typically accompanied by increased firmness of the tissue. All three components had to be present simultaneously, a deliberately conservative requirement designed to maximize specificity and prevent misclassification based on isolated, nonspecific splenic changes.

The results were unambiguous. The complete contraction triad was identified in 48 of the 54 hypothermia fatalities, a prevalence of 88.9 percent, but in only 2 of the 170 controls, or 1.2 percent. This translates into a sensitivity of 88.9 percent and a specificity of 98.8 percent, with a positive predictive value of 96.0 percent, a negative predictive value of 96.6 percent, and an overall diagnostic accuracy of 96.4 percent. The statistical association between splenic contraction and fatal hypothermia was extraordinarily strong, with an odds ratio of 672.0 and a 95 percent confidence interval stretching from 131.4 to 3437.2, far beyond the threshold of statistical significance. Histological examination of the spleen in every hypothermia case confirmed the macroscopic impression of red-pulp anemization, revealing a depletion of erythrocytes within the red pulp and empty vascular lumina consistent with the wholesale mobilization of the splenic blood store.

Perhaps the most intriguing result concerns how splenic contraction relates to the established markers of hypothermia. Among the classical findings, only Wischnewsky spots showed a statistically significant association with splenic contraction. No significant relationships emerged with cold erythema, the inner knee sign, hemorrhages within core skeletal muscles, or fatty degeneration of renal tubular epithelial cells. In practical terms, this means that splenic contraction does not simply ride along with the other tissue changes of cold death. Among contraction-positive fatalities, cold erythema was absent in more than a quarter of cases, and roughly a third lacked either muscle hemorrhages or renal fatty degeneration; in six cases, both of those deeper findings were missing entirely. Splenic contraction, in other words, appears to carry independent diagnostic information rather than redundant confirmation of what other signs already show.

This independence points toward a compelling pathophysiological interpretation. Hemorrhagic and degenerative lesions such as muscle hemorrhages and renal tubular fatty change generally require prolonged survival and sustained exposure to critical cold before they develop. Splenic contraction, by contrast, reflects an immediate physiological adaptation: acute sympathetic activation, circulatory centralization shunting blood toward vital organs, and the rapid expulsion of the splenic erythrocyte reservoir into the systemic circulation. The authors therefore propose that a contracted spleen may represent one of the earliest morphofunctional responses to lethal cold stress, visible at autopsy even when the slower-developing hemorrhagic and degenerative manifestations have not yet had time to appear. Supporting this view, the mean splenic weight in contraction-positive hypothermia cases was just 76.1 grams, compared with 132.5 grams in contraction-negative hypothermia cases and 175.4 grams in controls, and the difference could not be explained by age differences between the groups.

The scientific groundwork for this conclusion was laid decades ago, though it was largely forgotten. In 1944, the German researcher Wendt demonstrated experimentally in rabbits that whole-body cooling reduced spleen volume by up to one third, with the most pronounced contraction occurring at core temperatures of 24 to 26 degrees Celsius, and that the organ regained its normal size after rewarming. Subsequent animal studies by Varman and Bernshtein corroborated the spleen’s reservoir role under hypothermic conditions, showing decreases in splenic weight and volume accompanied by rising circulating hemoglobin concentrations. Isolated human case reports followed, including Horn’s account of a 49-year-old sailor who died of cold exposure after falling overboard, and retrospective series by Gillner and Waltz and by Schneider and Klug that noted contracted spleens in a minority of hypothermia deaths. Two doctoral dissertations touched on the finding, but neither provided the prospective, controlled evidence needed to establish its diagnostic value, and major forensic textbooks continued to relegate splenic contraction to quotation marks and question marks—or to omit it entirely.

The practical implications for forensic practice are considerable. Hypothermia deaths are frequently misinterpreted at first glance, particularly when the scene suggests sudden natural death, acute intoxication, or even violence. Cold erythema and ecchymosis-like discolorations on the limbs can mimic traumatic injuries, occasionally raising suspicion of assault. In such ambiguous situations, the conditions that mimic hypothermia typically produce a congested, blood-filled spleen, whereas a contracted, pale, wrinkled spleen points decisively in the opposite direction. Because the contracted spleen is readily visible the moment the abdominal cavity is opened—sometimes alongside reverse Wischnewsky spots visible through the gastric wall—its early recognition can redirect the differential diagnosis toward hypothermia and prompt targeted dissection of the back and core musculature, inspection of the knee joints, and supplementary histological and toxicological analyses. The authors also suggest that the finding could support minimally invasive postmortem approaches, such as laparoscopic inspection of body cavities combined with postmortem imaging, where early visual cues carry exceptional value.

Modern imaging may soon extend this diagnostic reach even further. Preliminary work with postmortem computed tomography has reported elevated splenic radiodensity in hypothermia deaths, consistent with a denser, more compact parenchyma produced by contraction, and the present study’s exploratory imaging data showed compatible tendencies, though the small number of cases precluded statistical analysis and will be reported separately. The researchers are careful to emphasize the limits of their work: the study was conducted at a single institution, the macroscopic assessment was not blinded, interobserver agreement was not formally measured, and histological examination of the spleen was performed only in the hypothermia group. Splenic contraction is not pathognomonic and must never be interpreted in isolation. Nevertheless, with nearly nine out of ten hypothermia deaths showing the triad and fewer than two percent of controls doing so, the evidence strongly supports adding routine splenic assessment to the forensic autopsy protocol—transforming an organ long dismissed as morphologically unremarkable into a quiet but eloquent witness to death by cold.

Subject of Research: Validation of reactive splenic contraction as a diagnostic autopsy sign of fatal hypothermia

Article Title: Spleen contraction verified as a supportive autopsy sign of fatal hypothermia

Article References: Zátopková, L., Kučerová, Š. P., Kovařík, D., Pažinová, J., Pitková, R., Bačinová, P., Janík, M., & Hejna, P. (2026). Spleen contraction verified as a supportive autopsy sign of fatal hypothermia. International Journal of Legal Medicine. https://doi.org/10.1007/s00414-026-03984-x

Image Credits: AI Generated

DOI: 10.1007/s00414-026-03984-x

Keywords: hypothermia, forensic pathology, spleen, splenic contraction, autopsy, Wischnewsky spots, cold erythema, postmortem diagnosis, forensic medicine, blood reservoir, postmortem imaging, legal medicine

Sepsis is a catastrophic dysregulation of the body’s response to infection, and it remains one of the leading causes of death worldwide, yet confirming it as the actual cause of death after a person has died is notoriously difficult. Autopsy findings in sepsis are often nonspecific: congestion, edema, and inflammatory infiltrates can be seen in many conditions, and the organs of a person who died of sepsis may look deceptively normal, particularly if death came quickly. Postmortem microbiology is similarly treacherous, because bacteria begin colonizing the body within hours of death, a process known thanatomicrobiologists call postmortem bacterial translocation. Cultures taken from a corpse can therefore grow organisms that had nothing to do with the fatal illness. Forensic pathologists have consequently searched for decades for a biochemical signature that survives death and still tells the truth about what killed the person.

Procalcitonin emerged as a candidate because of its unusual biology. In healthy people, procalcitonin is produced almost exclusively by the C cells of the thyroid gland as a precursor of the hormone calcitonin, and circulating levels remain vanishingly low. During systemic bacterial infection, however, extra-thyroidal tissues throughout the body, including liver, lung, kidney, adipose tissue, and muscle, are induced to express the CALC-1 gene, and procalcitonin levels can climb by several orders of magnitude within a few hours. The molecule is not substantially degraded after death, and previous forensic studies have shown that it remains measurable and relatively stable across extended postmortem intervals. That stability is precisely what makes it attractive as a postmortem marker, since bodies do not always arrive at the morgue promptly and decomposition begins immediately.

The new analysis, led by Aswini Chandran and colleagues, was rigorous in its design. The team searched four major databases, PubMed, Scopus, ScienceDirect, and the Cochrane Library, for studies that evaluated procalcitonin levels in postmortem samples. Eleven studies met the inclusion criteria, and eight of them provided sufficient data for pooled statistical analysis. Rather than relying on simple pooling alone, the researchers applied two sophisticated models designed specifically for diagnostic accuracy synthesis: the Reitsma bivariate random-effects model and the hierarchical summary receiver operating characteristic, or HSROC, analysis. These methods account for the trade-off between sensitivity and specificity that shifts with each study’s chosen cutoff value, producing a more honest picture of overall test performance than older univariate approaches.

The headline result was an area under the curve of 0.937 on the HSROC analysis, a figure that places postmortem procalcitonin firmly in the category of clinically excellent diagnostic tests. On the standard scale used in diagnostic medicine, an area under the curve of 0.5 indicates a test no better than a coin flip, while 1.0 represents perfect discrimination. Values above 0.9 are considered outstanding and are rarely achieved by biomarkers in any setting, let alone in the chaotic conditions of the autopsy suite. The researchers also noted that the marker’s performance held up robustly across variable postmortem intervals, meaning the test did not lose its discriminating power simply because a body had been dead for longer before sampling.

Sample choice mattered, however. Most of the included studies relied on peripheral blood, typically drawn from the femoral vein, which has become the standard site for postmortem biochemistry because it is far from the torso and therefore less contaminated by bacteria that translocate from the gut after death. Some studies instead measured procalcitonin in alternative matrices, including pericardial fluid, cerebrospinal fluid, and even the aqueous humour of the eye. Earlier work by the same research groups represented in the analysis, including studies by Palmiere, Schrag, and Schmidt, had explored these fluids as proxies when blood is unavailable or unsuitable, and the new review confirms that peripheral blood remains the preferred and best-validated choice for collection.

The history of this biomarker in forensic medicine stretches back more than two decades. Procalcitonin was first recognized as a marker of severe infection in the early 1990s, when Assicot and colleagues reported high serum concentrations in patients with sepsis in The Lancet. Forensic applications followed quickly: in 2001, Tsokos and Püschel published a landmark study in the International Journal of Legal Medicine demonstrating that serum procalcitonin could serve as a valuable biochemical parameter for the postmortem diagnosis of sepsis. Subsequent studies added C-reactive protein, interleukin-6, tumor necrosis factor alpha, lipopolysaccharide-binding protein, and soluble TREM-1 to the panel of candidate markers, but procalcitonin consistently emerged as one of the strongest single performers. The new meta-analysis is the first to formally synthesize this scattered literature with modern diagnostic accuracy methods.

The authors are careful to acknowledge the limitations of their evidence base. Only eight studies entered the pooled analysis, a small number that limited the statistical power of funnel plot interpretation, the standard tool for detecting publication bias. The included studies also showed heterogeneity in the assays used to measure procalcitonin and in the cutoff values chosen to define a positive result, which is why the researchers call for standardized thresholds in future work. They also emphasize that procalcitonin should never be interpreted in isolation: the biomarker is most powerful when correlated with autopsy findings, histopathology, and postmortem microbiology, forming a triangulated diagnosis rather than a single-molecule verdict.

Even with those caveats, the implications for forensic practice are significant. Sepsis-related deaths are frequently underrecognized, particularly when people die outside hospitals, and misclassification has consequences for mortality statistics, epidemiological surveillance, and legal proceedings ranging from insurance disputes to criminal investigations. A cheap, rapid, and reliable blood test that can be performed on femoral blood during a routine autopsy could transform the diagnostic workup of suspected infection deaths, much as postmortem biochemistry has already improved the detection of diabetic ketoacidosis and electrolyte disturbances. The researchers conclude that procalcitonin is a promising biomarker for forensic diagnostic practice and call for validation across different biological sample types and standardized cutoff values. If those follow-up studies confirm the pooled figures, the humble peptide once known only as a thyroid hormone precursor may become one of the most important tools in the mortuary, giving a voice to the dead about the infection that silenced them.

Subject of Research: Diagnostic accuracy of postmortem blood procalcitonin for identifying sepsis as a cause of death

Article Title: Postmortem Blood Procalcitonin (PCT) for identifying sepsis as a cause of death: a systematic review and meta-analysis

Article References: Chandran, A., Khadanga, S., Gupta, A., Chhabra, D., Kori, A., Lokhande, L., Sangita, M., Agrawal, A., & Arora, A. (2026). Postmortem Blood Procalcitonin (PCT) for identifying sepsis as a cause of death: a systematic review and meta-analysis. International Journal of Legal Medicine. https://doi.org/10.1007/s00414-026-03988-7

Image Credits: AI Generated

DOI: 10.1007/s00414-026-03988-7

Keywords: procalcitonin, sepsis, postmortem diagnosis, forensic pathology, biomarker, meta-analysis, autopsy, diagnostic accuracy, forensic medicine, blood test, International Journal of Legal Medicine, Postmortem

The review’s methodology tells its own story. De-Giorgio and Benedetti searched PubMed, Scopus, and Web of Science without date restrictions, combining AFM-related terms with post-mortem and autopsy keywords, and screened references manually to catch anything the databases missed. Despite the breadth of the search, only five original research articles met their strict criteria of focusing on human post-mortem materials with forensic relevance. That number is striking. AFM has been embraced enthusiastically in materials science, nanotechnology, biology, and clinical medicine for decades, yet its application to the tissues of the deceased remains in its infancy. The five qualifying studies concentrated on just four substrates: bone, skeletal muscle, tendinous tissue, and hair. This scarcity, the authors argue, reflects a combination of high instrumentation costs, small sample sizes, and substantial methodological heterogeneity that has kept the field fragmented.

Bone emerges as the most scientifically mature substrate in the review. Building on earlier animal studies that mapped elastic and inelastic deformation behavior and visualized the lacunar-canalicular network with exceptional precision, researchers turned to human autopsy samples to probe age-related changes in bone composition. In one key investigation, Milovanovic and colleagues characterized mineral grain size in bone harvested from the lateral femoral neck of two groups of women: young women aged 20 to 40 and elderly women aged 73 to 94. The older cohort exhibited larger and more heterogeneous mineral grains, a structural condition associated with reduced mechanical resistance. Crucially, chemical analysis of calcium and phosphorus levels revealed no significant differences between the groups, ruling out a major confounder and reinforcing the validity of the purely structural observations.

A follow-up study translated those structural differences into mechanical terms using AFM-based nanoindentation. The technique works by applying a controlled force to the sample surface and recording the corresponding force-distance curves, from which local mechanical properties can be computed with precision. The results showed that the differences in mineral grain size between young and elderly women translated into distinct elastic behaviors, with significantly reduced elasticity in the elderly group, an effect closely linked to higher fracture susceptibility. Although limited by sample size, the work demonstrated a reproducible methodological framework that the review’s authors believe could be extended to contexts far more directly relevant to forensic investigation, including the characterization of fracture margins in cases of suspected trauma.

It is in forensic traumatology that the review’s most provocative proposals appear. AFM topography and force mapping can quantify nanoscale roughness, microcrack patterns, and local stiffness gradients along fracture edges, capabilities that could support the differentiation between perimortem trauma, injuries inflicted around the time of death, and post-mortem damage that occurred afterward. One high-impact translational scenario involves cardiopulmonary resuscitation. CPR is well recognized to generate rib fracture patterns that can complicate post-mortem interpretation, sometimes mimicking injuries inflicted by an assailant. AFM could add objective surface and mechanical descriptors to complement macroscopic evaluation, radiology, and conventional microscopy, helping pathologists distinguish resuscitation artifacts from thoracic fractures unrelated to resuscitative maneuvers. In an era when CPR-related rib injuries are common and medico-legal disputes over their origin are frequent, such a tool could prove decisive.

Bone is also highly informative in cases of thermal exposure, including fires and explosions. Experimental work has shown that heating produces progressive physicochemical and structural modifications of bone mineral: crystallite parameters begin to change at temperatures of 500 degrees Celsius and above, while marked crystallite growth and recrystallization become prominent at higher temperatures, commonly reported around 700 degrees Celsius and beyond, with downstream effects on the stability and fragility of calcined remains. Post-mortem computed tomography, or PMCT, has already proven valuable in assessing burned victims, including the recognition of typical heat-related changes and the differentiation of heat-related fractures from traumatic ones. The review proposes a correlative framework in which PMCT provides non-destructive, case-level documentation of fracture patterns, ATR-FTIR spectroscopy and X-ray diffraction characterize temperature-related mineral and matrix transformations, and AFM targets selected regions for nanoscale topographic and nanomechanical mapping. The open question is whether thermal overprinting modifies or preserves the nanoscale features relevant to forensic interpretation, and AFM is positioned to answer it.

Soft tissue tells a different story, one in which water plays an unexpectedly large role. Studies on human iliotibial band samples investigated how variations in water content influence the mechanical properties of post-mortem soft tissues, and the findings were clear: lower water content increases the elastic modulus of the tissue. This has direct implications for anyone designing experiments on post-mortem soft tissues, since hydration status must be controlled for or at least reported. With specific regard to estimating the post-mortem interval, the elapsed time since death and one of the central questions in forensic practice, De-Giorgio and colleagues performed a preliminary investigation on skeletal muscle samples collected at different post-mortem intervals, applying AFM-based measurements of the Young’s modulus and hysteresis, the latter reflecting energy dissipation during loading cycles. Their results indicated that hysteresis is less influenced by inter-individual variability than the elastic modulus, making it a parameter worth prioritizing in future PMI-focused studies. This matters because traditional PMI methods, which rely on qualitative assessment of livor mortis, rigor mortis, and algor mortis, are fundamentally constrained by the examiner’s subjective evaluation and by intrinsic factors including age, sex, muscle mass, and ambient temperature.

Hair, remarkably durable and easy to sample, offers a third window into the post-mortem nanoworld. Mansilla and colleagues compared hair samples from contemporary autopsies with those from archaeological mummies to examine nanostructural cellular features. Compared with modern hair, the mummy samples exhibited a depletion of fatty acids and a reduction in the regularity of the cuticular scale pattern, although the scales themselves remained remarkably preserved even after centuries. The review’s authors suggest extending this analytical approach by comparing mummy hair across different historical periods and geographic regions, potentially revealing correlations between long-term environmental exposure and nanostructural hair alterations. Such a comparative framework could eventually help investigators assess whether remains are consistent with a claimed historical context or with a more recent death.

Perhaps the most forward-looking sections of the review concern substrates that have barely been touched in forensic settings. Skin, which has been extensively investigated with AFM in dermatological research on the epidermis and dermis, remains underexplored in forensic pathology, despite the fact that establishing wound vitality and age is often critical for medico-legal reconstruction and remains methodologically challenging. AFM-derived parameters such as surface topography, local stiffness mapping, and viscoelastic signatures could be investigated for their association with the post-trauma interval, provided that major confounders including hydration status, sampling site, and fixation protocol are explicitly controlled. The authors also point to dried bloodstains, where experimental studies have used AFM to estimate stain age by tracking changes in the mechanical properties of red blood cells over time, with subsequent work showing that substrate type, whether glass, metal, or ceramic, significantly affects the mechanical signature. Gunshot residue analysis represents another avenue, since AFM has already been applied to high-resolution characterization of GSR particle morphology and size distribution, with evidence that particle size distributions may vary as a function of shooting distance. Extending such analyses to peri-wound skin at entry and exit sites could reveal reproducible patterns related to muzzle-to-target distance and ammunition type. Even the subtle electrical current mark seen in electrocution victims, currently assessed mainly through histopathology and scanning electron microscopy with energy-dispersive X-ray analysis, could yield additional microfeatures to AFM’s nanomechanical mapping.

The review is candid about the obstacles standing between these visions and courtroom reality. The evidence base is constrained by small sample sizes, high instrumentation costs, and methodological heterogeneity spanning differences in sampling, preparation, AFM operational modes, and reporting standards. To support AFM as a reliable forensic tool, and ultimately strengthen its potential admissibility in court, the authors call for robust statistical reporting including appropriate summary measures, dispersion indices, and explicit assessment of reproducibility and measurement uncertainty. They also advocate multicentric research designs to increase sample representativeness and distribute financial and logistical burdens, along with standardized post-mortem imaging biobanks built on harmonized acquisition protocols to facilitate cross-study comparison and accelerate the integration of AFM-based metrics into forensic science. Bone, skeletal muscle, and hair remain the most practical starting points, being generally accessible at autopsy and collectable with limited manipulation. If those foundations are laid, the nanoscale may soon become a routine crime scene, one measured not in meters but in nanometers.

Subject of Research: Applications of atomic force microscopy to human post-mortem tissues in forensic medicine

Article Title: Atomic force microscopy in human post-mortem samples: current applications and future directions

Article References: De-Giorgio, F., & Benedetti, B. (2026). Atomic force microscopy in human post-mortem samples: current applications and future directions. International Journal of Legal Medicine. https://doi.org/10.1007/s00414-026-03976-x

Image Credits: AI Generated

DOI: 10.1007/s00414-026-03976-x

Keywords: atomic force microscopy, forensic science, post-mortem interval, forensic pathology, bone nanomechanics, nanoindentation, skeletal muscle, mummified hair, thermal bone alteration, wound age estimation, gunshot residue, legal medicine

The difficulty of diagnosing drowning is well known in the forensic community. Unlike many causes of death, drowning leaves behind no pathognomonic autopsy feature, no single sign that definitively proves a person died from liquid entering the airways. Instead, forensic pathologists arrive at the diagnosis by exclusion, combining circumstantial evidence such as witnessed submersions or suicide notes with macroscopic findings like external foam, pleural effusion, acute pulmonary emphysema, and Paltauf’s spots, alongside histological and toxicological investigations. The World Health Organization estimates that approximately 372,000 drowning deaths occur worldwide each year, making it the third-leading cause of accidental injury death, so the stakes for improving diagnostic accuracy are considerable.

Pathophysiologically, drowning is divided into two principal forms depending on the medium. When a person drowns in fresh water, the hypotonic liquid passes rapidly into the pulmonary circulation, producing haemodilution, hyperkalaemia, and hypervolaemia, and death generally ensues faster than in salt water. In saltwater drowning, by contrast, the hypertonic sea water draws fluid from the bloodstream into the lungs, causing hypokalaemia, hypovolaemia, and haemoconcentration. These opposite haemodynamic trajectories were the central hypothesis of the new study: if freshwater and saltwater drowning drive the body’s water balance in opposite directions, the proteins that regulate water movement in brain cells might respond in measurably different ways.

The research team, led by Rosario Barranco and Francesco Ventura of the University of Genova together with Tony Fracasso of the Lausanne-Geneva center, conducted a retrospective analysis of ten freshwater drowning cases drawn from Lake Geneva and saltwater drowning cases from the Mediterranean Sea, using ten deaths from acute external bleeding as a control group. The exclusion criteria were deliberately strict: cases involving people over 65 years of age, neurological or psychiatric disease, cardiopulmonary resuscitation, putrefaction, a postmortem interval exceeding 72 hours, or ethanol and drug intoxication were all removed from consideration. Tissue samples were taken from the frontal cerebral cortex, fixed in formaldehyde, embedded in paraffin, and cut into five-micrometer sections for staining with antibodies against each of the five target proteins.

Slides were evaluated under blinded conditions, with seven randomly selected microscopic fields per slide scored on a semi-quantitative scale from absent to intense. Inter-observer agreement was complete for 85 percent of the slides and intra-observer agreement reached 95 percent, giving the investigators confidence in the reproducibility of their scoring. Statistical comparisons were performed with the Kruskal-Wallis and Mann-Whitney U tests for global comparisons between the three groups, supplemented by Student’s t-test, with significance set at p less than 0.05.

The headline result concerns aquaporin 4, the most abundant water channel protein in brain parenchyma, which is localized primarily in astrocytes and the basolateral membrane of the ependyma. Freshwater drowning cases showed a particularly intense AQP4 expression, with seven of the ten cases reaching the maximum grade of 3, and the difference between freshwater drowning and both the saltwater and control groups was statistically significant. By contrast, no significant difference emerged between saltwater drowning cases and controls. The authors interpret this as activation of AQP4 in response to the osmotic stimulus and haemodilution that occur when hypotonic fresh water floods the pulmonary circulation, a terminal vital reaction that helps the brain eliminate excess water through the subarachnoid spaces in cooperation with proteins such as connexin-43 and the potassium channel Kir4.1.

Aquaporin 9 delivered a second encouraging result. This channel, expressed in astrocytes, glial cells of the pineal gland, subpial vessels, and neurons, plays a role in regulating water movement, cerebrospinal fluid production, astrocyte migration, and neuronal energy balance. Intense AQP9 expression was found in four of the freshwater cases, and the difference between freshwater drowning and the other two groups was statistically significant with the t-test, while the global tests showed a trend in the same direction. The researchers propose that the hypotonic stimulus of freshwater immersion activates both AQP4 and AQP9 to counteract haemodilution, facilitating the transport of water and small solutes and supporting neuronal metabolic adaptations during the final minutes of life.

The remaining markers proved harder to interpret. Aquaporin 5, found mainly in neurons and astrocytes of the grey matter, and vasopressin, the hormone that stimulates aquaporin activity largely through the V1a receptor, both showed significantly higher expression in freshwater drowning cases than in controls, but no significant differences separated freshwater from saltwater drowning or saltwater from controls. The authors suggest that saltwater drowning may represent an intermediate situation between freshwater drowning and the control group, with osmotic alterations activating these proteins to a lesser extent, and they caution that vasopressin is subject to endocrine and temporal fluctuations that are not consistently reflected in postmortem immunohistochemical signals. Glial fibrillary acidic protein, a marker of glial reaction associated with traumatic or chronic lesions, showed no significant differences between groups, a result the team regarded as expected given that GFAP is not specific to acute osmotic change.

The study only partially confirms the influential earlier work of An and colleagues, who in 2011 demonstrated increased intracerebral aquaporin 4 expression in freshwater drowning but also reported reduced expression in saltwater drowning. The Genoa and Geneva team did not reproduce that decrease, finding no statistically significant difference between their saltwater group and controls, and they hypothesize that the discrepancy may relate to the different chemical and salinity characteristics of the Mediterranean Sea compared with the ocean. To their knowledge, the new study is the first to analyze the immunohistochemical expression of the major brain aquaporins alongside vasopressin in drowning cases, extending a line of research that the same group has previously pursued in lung and kidney tissue with markers including aquaporin 2, aquaporin 5, vasopressin receptor 2, and renin.

The practical implications reach beyond the laboratory. In maritime cities crossed by rivers, a drowning may occur in fresh water before currents drag the body out to sea, and establishing where the fatal immersion actually took place can matter for reconstructing the circumstances of death. The authors are careful to frame AQP4 and AQP9 as promising complementary markers for the differentiation of freshwater and saltwater drowning rather than as independent diagnostic markers, and they acknowledge that their strict exclusion criteria, while minimizing confounding variables, restricted the number of cases in each group. Validation on larger samples, they conclude, will be essential before these molecular signatures can enter routine forensic practice, but the study marks a significant step toward an objective, protein-level diagnosis of one of forensic medicine’s most stubborn diagnostic challenges.

Subject of Research: Immunohistochemical cerebral cortex expression of aquaporins, vasopressin, and GFAP in freshwater and saltwater drowning for forensic diagnosis.

Article Title: Immunohistochemical cerebral cortex expression of aquaporin 4, aquaporin 5, aquaporin 9 Vasopressin and GFAP in saltwater drowning and freshwater drowning

Article References: Barranco, R., Ventura, F., & Fracasso, T. (2026). Immunohistochemical cerebral cortex expression of aquaporin 4, aquaporin 5, aquaporin 9 Vasopressin and GFAP in saltwater drowning and freshwater drowning. International Journal of Legal Medicine. https://doi.org/10.1007/s00414-026-04021-7

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DOI: 10.1007/s00414-026-04021-7

Keywords: drowning, freshwater drowning, saltwater drowning, aquaporin 4, aquaporin 9, vasopressin, GFAP, forensic pathology, immunohistochemistry, cerebral cortex, osmotic stimulus, forensic histopathology

Intussusception, a phenomenon classically associated with the gastrointestinal tract, involves the telescoping of one segment of a hollow organ into an adjacent part, commonly invoking acute obstruction and ischemia. Its occurrence within a coronary artery vessel had been hitherto undocumented in human clinical cases, making this report a pioneering revelation. The coronary arteries, responsible for perfusing the myocardium, are critical conduits whose structural integrity is paramount for sustaining life. The unusual inward folding or invagination of a coronary artery segment in this instance led to catastrophic hemodynamic occlusion.

The clinical manifestation culminating in this fatal event was sudden cardiac death (SCD)—a tragic endpoint defined by an abrupt loss of cardiac function leading to death, often within minutes of symptom onset. SCD accounts for a significant proportion of mortality worldwide, predominantly linked to arrhythmias, myocardial infarction, or structural heart defects. However, the underlying causes can be cryptic in numerous cases, emphasizing the value of detailed post-mortem investigations such as this one.

The forensic autopsy unveiled intussusception as the causal lesion by demonstrating the unique morphological alterations within a coronary artery. The segment of the intussuscepted vessel created a mechanical obstruction akin to a physiological trap, severely restricting blood flow to critical myocardial territories. Microscopic examination reinforced the diagnosis by revealing disruption of the intimal layers and vascular wall architecture, hinting at the complex pathophysiological cascade that ensued prior to death.

What renders this case especially compelling is the rarity and diagnostic elusiveness of coronary artery intussusception. Unlike more familiar coronary pathologies such as atherosclerotic plaque rupture or embolism, intussusception lacks hallmark clinical signs and is invisible to conventional imaging techniques employed ante-mortem. The absence of warning symptoms, coupled with sudden occlusion, underscores this entity as a stealthy perpetrator in sudden cardiac fatalities.

The etiology behind the spontaneous intussusception remains speculative but intriguing hypotheses propose localized vessel wall weakness or aberrant contractile forces as contributing factors. Autoimmune or inflammatory processes could render the vascular layers susceptible to delamination, paving the way for telescoping under normal hemodynamic stress. Alternatively, congenital structural variants might predispose individuals to such vascular vulnerabilities.

Understanding these mechanisms not only expands the scientific comprehension of coronary artery diseases but also beckons a paradigm shift in how unexplained sudden cardiac deaths are approached. It challenges forensic pathologists and clinicians to consider uncommon vascular anomalies during autopsy and clinical evaluation, potentially refining protocols and preventative strategies.

The implications span beyond academic fascination; recognizing coronary intussusception can influence medico-legal outcomes and guide family counseling concerning inheritable risks. Genetic investigations alongside detailed histopathological scrutiny could pave the way for identifying at-risk individuals through innovative biomarkers or imaging modalities yet to be developed.

This case report also prompts a reexamination of current cardiovascular imaging technologies. Conventional angiography or computed tomography may not capture subtle intramural vascular distortions characteristic of intussusception. Future advancements like high-resolution intravascular ultrasound or optical coherence tomography might prove indispensable in detecting such elusive vascular phenomena.

Critically, this discovery sparks curiosity regarding potential therapeutic interventions. If identified preemptively, surgical correction or endovascular approaches might prevent catastrophic myocardial ischemia. However, the rarity and unpredictable nature of intussusception pose formidable challenges to the formulation of clinical guidelines.

From an investigative standpoint, the interdisciplinary collaboration between forensic medicine and cardiology was pivotal in unraveling this case. Such synergy exemplifies the importance of diverse expertise converging to decode perplexing medical mysteries, enhancing the collective arsenal against sudden cardiac deaths.

The broader medical community stands to gain immensely from heightened awareness of coronary artery intussusception. Educating clinicians, pathologists, and radiologists about this rare entity could incite more meticulous evaluations and reporting of similar cases globally. A growing database can yield epidemiological insights and inform future research trajectories.

Ultimately, this seminal case report is a clarion call to deepen investigative resolve in cases of sudden cardiac death where common etiologies fall short. It epitomizes the ceaseless quest for knowledge in medicine—unveiling hidden pathologies that lurk beneath the surface, forever reshaping our understanding of human health and disease.

Subject of Research: Sudden cardiac death caused by coronary artery intussusception

Article Title: Sudden cardiac death due to intussusception of a coronary artery: a case report

Article References:
Attico, F., Di Paola, F., De Nadai, M. et al. Sudden cardiac death due to intussusception of a coronary artery: a case report. Int J Legal Med (2025). https://doi.org/10.1007/s00414-025-03632-w

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The case resurfaced as forensic experts noticed anomalously high concentrations of isopropanol and chlorhexidine—both common antiseptic agents—present in tissue samples collected during a routine autopsy of an infant who had passed away under unexplained circumstances. These substances, while widely used for their disinfecting properties in medical and forensic settings, are typically expected to dissipate or remain at negligible levels postmortem. Their unexpected presence raised immediate concerns about potential procedural contamination, triggering a deeper investigation into the methodologies employed during the autopsy.

Isopropanol, commonly known as rubbing alcohol, and chlorhexidine, a potent antimicrobial agent often applied to skin before surgical intervention or sample collection, are standard components in the disinfection arsenal. However, their chemical interactions and persistence in cadaveric tissues have not been extensively studied in forensic contexts, particularly in pediatric cases. The persistence of these compounds in the delicate tissues of infants introduces a new variable that must be accounted for when interpreting toxicological results.

Upon meticulous review, the forensic team traced the source of contamination not to antemortem exposure but rather to the postmortem handling protocol. It appeared that a disinfection procedure employed during the autopsy deviated from established guidelines, leading to inadvertent immersion or prolonged contact of tissue samples with solutions containing isopropanol and chlorhexidine. This procedural lapse resulted in the absorption and retention of these chemicals in the infant’s tissues, subsequently detected through sensitive analytical instrumentation.

This finding holds profound ramifications for forensic science. Chemicals introduced during postmortem processing can mimic or mask pathological findings, potentially confounding cause-of-death analyses. For example, the presence of isopropanol might erroneously suggest intoxication, while chlorhexidine could interfere with microbial cultures or histological examinations. By demonstrating how improper disinfection methods lead to these artifacts, the case advocates for stringent procedural standardization to uphold the integrity of forensic evidence.

Extensive chemical analysis employed in this investigation utilized advanced chromatographic and mass spectrometric techniques, allowing quantification of trace levels of disinfectants within tissue matrices. These methodologies, optimized for forensic toxicology, revealed the depth of contamination and distinguished between compounds introduced antemortem versus those absorbed postmortem. The precision of these analytical tools highlights the evolving sophistication of forensic diagnostics, although it also reveals vulnerabilities where procedural errors can skew results.

In addition to analytical advancements, this case accentuates the critical role of proper training and adherence to protocols among forensic pathologists and mortuary personnel. The complexity of handling forensic specimens demands a rigorous regimen where every step, from initial external examination to sample preservation, is designed to minimize contamination risks. Deviations, even minor, can propagate unforeseen consequences, as seen in this infant’s case, emphasizing the need for continual education and quality control.

The ethical dimensions of such findings are equally significant. Families of deceased individuals seek clear, accurate explanations for their loved ones’ deaths. Contaminations that obscure postmortem data complicate these efforts, potentially resulting in misdiagnoses or unwarranted suspicion. This scenario underscores the broader societal imperative for forensic processes to be beyond reproach, combining scientific rigor with transparency to maintain public trust.

Further research inspired by this case may focus on mapping the kinetics of antiseptic agents in cadaveric tissues under varying conditions. Such studies would elucidate the persistence and diffusion patterns of these chemicals, helping forensic investigators discern genuine toxic exposures from procedural artifacts. In parallel, new guidelines might be developed to refine disinfection techniques that balance sterility with sample integrity, possibly introducing alternative agents with minimal postmortem retention.

This incident also prompts a reevaluation of autopsy room practices, including the selection of disinfectants, exposure times, and contact surfaces. The compatibility of various chemical agents with forensic analyses should form part of comprehensive best-practice recommendations, ideally informed by collaborative efforts among toxicologists, pathologists, and forensic chemists. Introducing validation steps post-disinfection to confirm the absence of contamination might become a standard safeguard.

Technology may also play an instrumental role in mitigating such issues. Automation of disinfection procedures could reduce human error, while real-time detection systems may flag unexpected chemical residues prior to in-depth analyses. Additionally, forensic laboratories might implement stricter environmental controls and workflow designs that segregate disinfection zones from sample processing areas to minimize cross-contamination.

In the broader context of forensic science, this case serves as a poignant reminder that scientific outcomes are only as reliable as the procedures that yield them. As forensic techniques become increasingly sensitive and capable, the margin for procedural error narrows, placing a premium on accuracy and consistency. Lessons learned from this investigation can potentially prevent future misinterpretations, safeguarding the pursuit of truth in medicolegal death investigations.

The scientific community’s response to these findings will be watched closely. Scholarly discourse will likely delve into the balance between necessary asepsis and analytical purity, fostering dialogue that may reshape forensic operational norms globally. By bringing to light the impact of overlooked procedural factors, this case widens perspectives on how forensic evidence must be handled and interpreted.

Ultimately, the detection of isopropanol and chlorhexidine in an infant’s postmortem tissues hinges on a nuanced understanding of the interplay between biological decomposition processes and external chemical exposures during forensic examination. This interplay defines the boundaries within which forensic science must operate to deliver conclusive, credible results that withstand legal scrutiny. Upholding these standards ensures justice is truly served as forensic experts unravel the mysteries behind untimely deaths.

The ramifications of this case extend beyond forensic medicine, touching on clinical, legal, and ethical dimensions that collectively shape how society comprehends death and accountability. As the field moves forward, integrating these insights will be essential to optimize procedural reliability and reinforce the foundational trust placed in forensic investigations.

Subject of Research: Postmortem contamination in forensic autopsy linked to disinfection procedures involving isopropanol and chlorhexidine in an infant case.

Article Title: Unusual findings of isopropanol and chlorhexidine in a 4-month infant: a case of postmortem contamination linked to an inappropriate disinfection procedure.

Article References:
Knapp-Gisclon, A., Mayer-Duverneuil, C., Rambaud, C. et al. Unusual findings of isopropanol and chlorhexidine in a 4-month infant: a case of postmortem contamination linked to an inappropriate disinfection procedure. Int J Legal Med (2025). https://doi.org/10.1007/s00414-025-03565-4

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