The distinction matters because disagreement is not the same as error. A discrepancy occurs when two interpretations differ, whereas a diagnostic error requires an incorrect interpretation judged against an appropriate reference standard. Veterinary researchers have documented substantial inter-observer variability, examined errors in educational settings and studied factors associated with radiographic interpretation, but consensus reports or second-reader agreement cannot establish that an answer is correct if both readers share the same mistake. Suitable reference standards may include histopathology, cytology, surgical findings, laboratory or microbiological testing, follow-up, repeat imaging or alternative modalities, depending on the clinical question. In practice, these sources may be unavailable, incomplete or inaccessible to the original interpreter, limiting both assessment and feedback.

Human radiology offers a model for moving beyond counts of conflicting reports. Research over several decades established that image interpretation is a measurable process shaped by perception, cognition, environment and workflow, rather than simply a test of individual knowledge. A central distinction separates perceptual errors, in which a visible abnormality is not detected, from cognitive errors, in which a detected finding is interpreted incorrectly. Observer studies, eye tracking, search-pattern analysis, workload experiments and secondary-interpretation studies have shown how fatigue, interruptions, time pressure, case complexity, cognitive overload and organizational conditions can affect detection. Familiar mechanisms such as satisfaction of search, anchoring, framing and inattentional blindness can also alter judgments. The veterinary literature contains early work on some of these mechanisms, including satisfaction of search, visual observation skills and diagnostic reasoning, but the authors say these efforts have not yet formed an integrated observer-performance field.

Veterine practice introduces difficulties that make direct transplantation of human methods insufficient. Clinical histories are mediated through animal owners and referring veterinarians, so information reaching a radiologist may be incomplete, heterogeneous or already shaped by another person’s interpretation. The source notes that pertinent history and signalment improved diagnostic accuracy in canine thoracic radiography, illustrating the potential influence of contextual information. Reliable measurement is also complicated by differences among first-opinion clinics, referral hospitals, academic institutions and commercial teleradiology services. These environments vary in case complexity, workload, access to information and subspecialization, while acquisition, transmission, documentation and quality-control problems can affect the images available for interpretation. Species diversity, non-verbal patients and the rapid growth of remote reporting add further layers of variation that a standardized study protocol must account for.

Against that background, the perspective argues that veterinary imaging should adopt a “just culture” approach to error analysis. This model, drawn from other safety-critical fields, balances professional accountability with the need to understand why errors occur. Reckless behavior, in which a practitioner consciously disregards risk, may warrant sanction; at-risk behavior, such as failing to recognize a real danger, may call for coaching; and human error, defined as a mistake without recklessness, generally should not be treated as grounds for punishment. The approach is not an absence of accountability. Negligent or grossly incompetent conduct that risks serious harm may still require an appropriate response. Its purpose is to examine contributory factors, encourage disclosure and prevent recurrence, especially because punitive environments can suppress reporting and create psychological or professional harm for practitioners.

As the first research priority, the authors call for robust, reproducible and disease-appropriate methods for measuring diagnostic performance. Studies need consistent definitions of error, valid reference standards, transparent performance metrics and reporting practices that permit comparison across institutions, modalities and observer groups. Structured institutional discrepancy review with predefined categories could provide a practical foundation for monitoring performance over time. Double-reading and consensus protocols remain useful for identifying disagreement, but the perspective emphasizes that they cannot replace a reference standard when the question is diagnostic correctness. Standardized measures would allow the field to move from isolated reports toward benchmarks that can support quality assurance and reveal meaningful differences between readers or practice environments.

The second priority is to determine why errors occur. Multicentre observer studies could quantify the relative influence of perception, cognitive bias, experience, fatigue, workload, workflow and environmental conditions across first-opinion practices, referral centers and teleradiology services. Such work would need to avoid treating a discrepancy as an isolated outcome and should examine the conditions in which each error arises. Artificial-intelligence decision support adds a new research question: AI may improve detection or prompt observers to reconsider a judgment, but it may also encourage automation bias or over-reliance. Conversely, clinicians may inappropriately reject useful AI advice. Comparisons of unaided and AI-assisted interpretation, conducted with adequate domain expertise and human oversight, could clarify when computational support improves performance and when it creates new error pathways. The authors also propose studying how discrepancy reporting and nonpunitive feedback affect willingness to report mistakes, learning, practitioner wellbeing and performance.

The third priority is to test interventions rather than assume that education or technology will help. Candidate measures include educational programs, structured feedback, regular discrepancy-review meetings, quality-assurance systems and decision-support tools. Their effects should be assessed under routine clinical conditions to determine whether improvements seen in controlled settings persist in practice. AI should complement rather than replace diagnostic expertise: a user without enough knowledge to assess a finding independently may also struggle to recognize an incorrect AI recommendation. This transition from descriptive observer studies to interventional studies is necessary if diagnostic-error research is to produce measurable benefits in education and quality assurance. The perspective does not establish that any particular intervention improves veterinary care; it identifies where prospective evaluation is needed.

The fourth priority is a collaborative network spanning veterinary institutions, referral centers, general practices, teleradiology services and academic centers. Shared protocols for recording and classifying errors, common performance metrics, benchmarking initiatives and harmonized datasets could make multicentre studies more generalizable and create resources for future AI research. The authors also argue for multidisciplinary participation from social science, veterinary ethics, education, human factors and human-computer interaction, because cognitive, organizational, ethical and technological determinants cannot be addressed by imaging studies alone. Academic institutions are proposed as coordinating hubs capable of bringing together diverse clinical settings. This perspective ultimately presents diagnostic error as an inevitable but measurable feature of veterinary imaging. By defining methods, examining mechanisms, evaluating responses and coordinating evidence, the authors argue that the field could move beyond individual failure toward systematic learning intended to improve diagnostic performance, patient care and animal welfare, although the clinical benefits of that transition still require testing.

Subject of Research: Diagnostic error and observer performance in veterinary diagnostic imaging

Article Title: Diagnostic error in veterinary imaging: an underexplored field and future directions for observer performance research

Article References: Burti, S., Zotti, A., Coghlan, S., & Banzato, T. (2026). Diagnostic error in veterinary imaging: an underexplored field and future directions for observer performance research. Frontiers in Veterinary Science, 13, Article 1978054. https://doi.org/10.3389/fvets.2026.1978054

Image Credits: AI Generated

DOI: 10.3389/fvets.2026.1978054

Keywords: veterinary imaging, diagnostic error, observer performance, radiology, veterinary medicine, human factors, quality assurance, artificial intelligence, teleradiology, just culture, Diagnostic, error

These results establish preliminary procedural feasibility rather than clinical efficacy, and the researchers emphasized that validation in living animals is still required. The ventral branches of the L6 and L7 spinal nerves form much of the lumbosacral trunk, which continues as the sciatic nerve, with smaller contributions from S1 and a variable contribution from S2. These nerves give rise to branches that supply the pelvic-limb muscles and skin.

At the lumbosacral junction, narrowing of the vertebral canal or intervertebral foramina, together with ventrolateral vertebral new bone formation, can compress the L7 spinal nerve and impair its accompanying blood vessels. Nerve displacement, compression, vascular impairment, inflammation, perineural fibrosis and demyelination may therefore occur in the region. Degenerative lumbosacral stenosis is common in dogs and has been associated with compressive neuropathy in as many as 68% of cases.

Perineural injection therapy places medication around a targeted nerve under image guidance. Ultrasound- and fluoroscopy-guided approaches have previously been described for the canine lumbosacral junction, while ultrasound-guided dorsal and lateral approaches have been investigated around the L5 and L6 foraminal regions in canine cadavers. A ventral approach targeting L7 with ultrasound alone had not previously been described.

The investigators sought to identify the L7 nerve ventral to the L7–S1 neuroforamina and place injectate at the level of the nerve and foramen while avoiding nearby major vessels, the colon and the femoral nerve. Their success criteria focused on placement: computed tomography had to show direct contact between contrast material and the L7 nerve within a defined anatomical compartment. The prospective, single-center feasibility study involved seven cadavers of medium- to large-breed dogs, each weighing at least 15 kg.

The animals had died or been euthanized for reasons unrelated to the experiment, and owners had consented to scientific use of the bodies. Their median age was seven years, with a range of three to 11 years; median body weight was 39 kg, with a range of 23 to 61 kg; and median body condition score was 5 on the nine-point scale, with a range of 4 to 8. Two dogs were overweight, with body condition scores of 7/9 and 8/9.

Four cadavers had no visible osseous changes at L7–S1, whereas three showed moderate ventral or ventrolateral spondylosis deformans. Among those three, two also had foraminal narrowing, one had mild articular process hypertrophy and one had irregular vertebral endplates. One affected cadaver had an asymmetrical transitional lumbosacral vertebra.

Before injection, each lumbosacral junction was scanned by photon-counting computed tomography with the cadaver in dorsal recumbency and the hind limbs extended. Images were reconstructed with both soft-tissue and bone algorithms. For ultrasound imaging, an ECVDI diplomate and second-year imaging resident first visualized the junction in a mid-sagittal plane, then fanned the transducer laterally and angled it caudally to locate the L7 spinal nerve ventral to the L7–S1 neuroforamina.

The transducer was subsequently rotated into a transverse plane. Nearby landmarks, including the external iliac veins and arteries, L6 spinal nerve, colon and femoral nerve, were identified to plan a trajectory that avoided puncture of those structures. Gentle to moderate transducer pressure generally improved visualization of the spinal nerves and displaced intestines, the urinary bladder and large vessels.

An injection path through the iliopsoas muscle was accepted when needed to reach a safe route to the nerve. A 20- or 22-gauge needle, selected according to cadaver size and the depth of the target, was inserted medial to the transducer in an in-plane approach. The shaft and tip remained visible on real-time B-mode ultrasonography as the needle advanced mainly in a ventrodorsal direction.

For each side, the investigators deposited 0.6 milliliters of a one-to-one solution containing methylene blue and the non-ionic iodinated contrast agent Accupaque 300 at the level of the L7 nerve and neuroforamen. Ultrasound was used to observe dye spread during injection, after which a repeat CT scan was performed in the same position and with the same parameters as the pre-procedural scan. A cadaver selected with owner consent was also dissected anatomically to confirm staining of the L7 nerve and inspect regional tissue for dye distribution, vascular damage and epidural contamination.

On CT, an injection was considered successful when contrast material directly contacted the L7 spinal nerve within the compartment bounded dorsally by the iliocostalis lumborum muscle and pelvic surface of the sacrum and laterally by the iliopsoas muscle. Among the 11 successful injections, five showed circumferential distribution corresponding to an indirectly outlined tubular nerve segment, three encompassed approximately half of the nerve circumference and three made direct contact without encircling the nerve. Bilateral success occurred in five cadavers, while one additional cadaver had unilateral success.

Five of six injections succeeded among the three cadavers with degenerative lumbosacral changes, including the cadaver with a transitional vertebra. The three failures all occurred in the two overweight cadavers. No inadvertent contrast injection into blood vessels, the peritoneal space, colon or urinary bladder was detected.

Contrast extended into the neuroforamen in three specimens, with minimal epidural extension in two. Anatomical dissection of the selected 3.5-year-old Labrador Retriever confirmed bilateral, symmetrical and circumferential methylene-blue staining of the proximal L7 nerves, extending more than two centimeters on each side. The L6 branch joining L7 was stained in its entirety, and its small obturator branch showed mild staining on the right and marked staining on the left.

The proximal obturator nerve was strongly stained up to the point where that branch joined. Regional connective tissue and fat surrounding the dyed nerves were also stained, as was tissue ventral to the caudal half of the L7 vertebral body on one side. This dissection supported the CT interpretation of injectate placement, although direct anatomical confirmation was available for only one of the seven cadavers.

Several limitations constrain what can be inferred. The sample was small and drawn from one institution, so the results are descriptive and cannot establish safety, pain relief or functional benefit in living dogs. Cadaveric tissues also lack physiological conditions present in anesthetized patients, including body temperature, muscle tone, vessel pulsation and lymphatic or venous drainage; these factors could alter injectate spread.

The study mixture contained 50% contrast agent, increasing viscosity compared with liquid medications typically used for perineural injection therapy and likely affecting distribution. Lower-viscosity solutions may spread over a larger area. Procedures were performed by a board-certified diagnostic imaging diplomate and an imaging resident, but the effect of differences in training and operator experience was not evaluated.

Ultrasound visibility can also be impaired by intestinal gas. A redundant, gas-dilated descending colon complicated access to the right L7 nerve in one cadaver, while proposed preparatory measures such as an enema or bladder emptying were not evaluated. Overall, the results suggest that ultrasound can guide a ventral needle trajectory to the canine L7 spinal nerve, including in specimens with degenerative lumbosacral changes.

The approach may be particularly compatible with ultrasound guidance because manual transducer pressure can displace intervening structures while the operator watches the needle and its tip continuously. Body condition nevertheless emerged as an important variable: all five injections in normal-weight cadavers succeeded, compared with five of six injections in cadavers with degenerative changes, while all failures occurred in overweight animals. Technical success did not establish therapeutic success.

The extent of contrast coverage considered adequate on imaging has no established threshold for predicting clinical benefit, and the relationship between perineural distribution and pain relief remains uncertain. The study therefore provides a procedural foundation for further work but does not yet show that ultrasound-guided L7 perineural injection can safely relieve pain or improve function in living dogs. Subsequent in vivo studies must determine spread under physiological conditions, quantify adverse events, measure therapeutic benefit and establish how strongly outcomes depend on operator experience.

Subject of Research: Cadaveric feasibility of ultrasound-guided perineural injection of the canine L7 spinal nerve

Article Title: Ventral approach for ultrasound-guided perineural injection of the canine L7 spinal nerve: a cadaveric feasibility study

Article References: Dittmann, R., Haenssgen, K., Kaessmeyer, S., Schweizer, D., & Barge-Carmona, P. (2026). Ventral approach for ultrasound-guided perineural injection of the canine L7 spinal nerve: a cadaveric feasibility study. Frontiers in Veterinary Science, 13, Article 1932351. https://doi.org/10.3389/fvets.2026.1932351

Image Credits: AI Generated

DOI: 10.3389/fvets.2026.1932351

Keywords: canine L7 nerve, ultrasound guidance, perineural injection, veterinary imaging, lumbosacral neuropathy, dog cadavers, computed tomography, procedural feasibility, Ventral, approach, ultrasound-guided, perineural

The stakes are higher than they might appear. More than 2,000 amphibian species are listed as endangered, and populations are declining worldwide, making captive breeding and reintroduction programs critical lifelines. Knowing the sex of individual animals is essential for pairing breeders, managing genetic diversity, and timing reintroductions. Yet many amphibians show no external signs of sex until maturity, and even adults can deceive. Body size overlaps substantially between the sexes, offering only about 70 to 75 percent accuracy in adult frogs. Hormone measurements from blood, urine, or feces can be thrown off by seasonal cycles, stress, or captive housing conditions. Nuptial pads on males’ thumbs and other secondary traits often appear only around the breeding season, and the absence of environmental cues in captivity can suppress them entirely.

Genetic testing might seem like the obvious answer, but amphibian genetics complicates rather than simplifies matters. Most amphibians lack distinct sex chromosomes of the kind that make molecular sexing routine in mammals and birds, and polyploidy is common, so researchers must develop species-specific genetic markers before a single swab can be read. Worse, genotypic sex can be overridden by environmental influences during embryonic or larval development, meaning an animal’s chromosomes and its actual, functional sex may not match. For conservation programs that need to know which animals will lay eggs and which will fertilize them, phenotypic sex—the sex written in the gonads—is what truly matters.

That reality has long pushed veterinarians toward direct examination of the gonads, typically through coelioscopy, a surgical technique in which a tiny camera is inserted into the body cavity. Coelioscopy is reliable, but it carries financial costs, health risks, and ethical concerns, particularly for small and delicate species. Non-invasive imaging has shown promise in adult amphibians: ultrasonography has been used to identify gravid females and assess reproductive status, and a handful of studies have used CT and MRI to visualize reproductive organs in mature animals. But no peer-reviewed study had formally tested whether these techniques could work in juvenile amphibians, whose gonads are minuscule and whose bodies are barely larger than a coin.

The Hungarian team, led by Nikolett Ujhegyi and Veronika Bókony of the HUN-REN Centre for Agricultural Research, tackled the question using 19 healthy agile frogs (Rana dalmatina) raised in captivity from eggs collected in the wild. The animals were examined at two ages—1.8 and 2.5 years—spanning the transition to sexual maturity, which in this species arrives around age two in males and age three in females. At the first imaging session the frogs averaged just 6.74 grams in body weight and about 41 millimeters in snout-vent length, with no visible secondary sexual characteristics in any individual. Crucially, every examiner was blind to the sex of the animals being scanned, and all individuals’ gonads were later confirmed by coelioscopy, giving the imaging results a gold-standard benchmark.

The imaging lineup ranged from the everyday to the exotic. Ultrasound was performed with a standard veterinary unit of the kind found in small-animal clinics, using a curved array transducer with a frequency range of 3.0 to 11.0 MHz. CT scans were acquired on a human dental cone-beam machine with 450-micrometer resolution—so generous in field of view that the team built a handmade three-level stand allowing up to nine frogs to be scanned simultaneously. MRI was conducted on a 3-Tesla NanoScan PET/MRI system with a 600 mT/m gradient, using a T1-weighted three-dimensional gradient echo sequence optimized through trial of multiple sequence types. Anesthesia was tailored to each procedure: short baths of buffered MS-222 for CT and coelioscopy, and longer-acting intramuscular alfaxalone for MRI sessions that could run over an hour and a half.

The results drew a sharp line between what each machine could and could not see. Ultrasound clearly revealed eggs in a formalin-preserved gravid female used as a reference, and in the live animals it picked up intestines, lungs, and a beating heart—but parenchymal organs, including gonads, remained indistinct in the juveniles. By autumn, when one female had developed mature eggs, ultrasonography correctly identified her, yet the image of an immature female was indistinguishable from that of a mature male. The dental CT scanner fared worse: bones and air-filled structures were recognizable, but no soft-tissue organs could be distinguished at all, and the method was abandoned for mature animals. The 110-kilovolt tube voltage, suitable for dental work, provided too little contrast between soft tissues to reveal anything as subtle as a juvenile frog’s gonad.

MRI, by contrast, delivered a genuine surprise. In the spring scans, when none of the frogs showed any external sign of sex, the testes were already identifiable in juvenile males—structures roughly two millimeters long that no other modality could resolve. The team could also map the heart, liver, lungs, stomach, gallbladder, kidneys, muscles, vertebrae, and spinal cord. By autumn, MRI correctly sexed a mature male and a mature female whose ovaries had developed, though it failed on a female whose ovaries were still immature. The ovaries of young females remained invisible across every method and every session, a limitation the authors attribute to the fact that undeveloped ovaries offer too little signal and too little size for current clinical resolutions to distinguish.

The comparison with earlier studies is instructive. Previous ultrasound successes in identifying testes involved either much larger animals—African clawed frogs reaching up to 140 millimeters—or high-resolution equipment with transducer frequencies of 17 to 22 MHz, far beyond the 3-to-11 MHz range of typical clinic machines. In those studies, testes resembled kidneys and could be told apart only by position, size, and edge irregularity, distinctions that required an experienced ultrasonographer. The agile frogs in this study had testes of roughly two millimeters at two years of age, growing to about four millimeters by maturity—far below the five-to-ten-millimeter range that made testes visible in larger species. Body size, the authors conclude, may be the decisive constraint on ultrasound sexing in small anurans.

The team’s recommendations are pragmatic. For mature females, ultrasound is the clear winner: it is fast, widely available, requires no sedation, and reliably reveals developed ovaries even in small-bodied frogs. For immature animals, no tested method is fully reliable, though MRI’s ability to detect juvenile testes suggests that optimized protocols—ideally tested on animals of known sex—could push the technology further. The authors also flag welfare concerns that deserve attention: MRI scanning time is limited by anesthesia duration, and the acoustic noise of magnetic resonance imaging, known to harm experimental animals in other taxa, has never been assessed in amphibians whose hearing plays a central role in reproduction. Contrast-enhanced CT, which improved organ visualization in prior studies, was deliberately avoided here because the frogs were part of a long-term experiment and the safety of contrast agents in amphibians is unknown. The path forward, the researchers argue, lies in exploring high-frequency ultrasound—already proven in large, mature frogs of both sexes—as the most accessible and least risky route to cracking the juvenile sexing problem, a capability that could reshape how conservationists manage the thousands of amphibian species now fighting for survival.

Subject of Research: Non-invasive imaging techniques for determining phenotypic sex in juvenile amphibians

Article Title: Testing minimally invasive imaging methods for phenotypic sex determination in immature frogs

Article References: Ujhegyi, N., Bókony, V., Ziszisz, Á., Kovács, N., Horváth, I., Rozsnyik, M. Z., Limboczki, R., Lini, Á. B., Berkei, G., Nemesházi, E., Kásler, A., Mikó, Z., Máthé, D., Szigeti, K., & Balogh, E. (2026). Testing minimally invasive imaging methods for phenotypic sex determination in immature frogs. Frontiers in Veterinary Science, 13, Article 1934243. https://doi.org/10.3389/fvets.2026.1934243

Image Credits: AI Generated

DOI: 10.3389/fvets.2026.1934243

Keywords: amphibians, frogs, sex determination, ultrasound, MRI, computed tomography, veterinary imaging, conservation, Rana dalmatina, gonads, juvenile animals, reproductive biology

The study, conducted at a protected wildlife rehabilitation centre in Kerman province, examined ten mature long-legged buzzards weighing between 650 and 750 grams. Because the species is monomorphic, meaning males and females cannot be distinguished by external appearance, and because the birds were imaged outside the breeding season with no active gonads visible on radiographs, the sex of each animal remained undetermined. An avian specialist confirmed all ten were mature based on physical characteristics, though precise ages could not be established. Each bird received a physical examination to rule out health complications that might skew the results, and body weights were measured individually on a digital balance so that anaesthetic doses could be calculated with precision.

Imaging required careful sedation with a combination of ketamine at 20 milligrams per kilogram and diazepam at 1 milligram per kilogram, administered intramuscularly to minimise stress and movement. The researchers then captured two standard orthogonal radiographic views of each wing, a medio-lateral projection and a ventro-dorsal projection from the coelomic cavity, using a direct digital radiography system set at 60 kilovoltage peak and 2.5 milliamperage-seconds with a source-to-detector distance of 90 centimetres. The birds were placed in dorsal recumbency with their wings extended, and all images were archived in a picture-archiving and communication system for later analysis.

Computed tomography followed on a 16-slice scanner, with the animals again positioned in dorsal recumbency and their wings and legs secured with microporous surgical tape. The CT protocol used 120 kilovoltage peak and 150 milliamperage-seconds, a rotation time of one second, a slice thickness of just 1 millimetre and a pitch of 1. After scanning, the images were reconstructed into bone planes on a specialised workstation, allowing the team to interrogate the humerus in cross-section in a way no plain radiograph can match. Eight parameters were then measured by a single observer across both modalities: the cranio-caudal diameter of the bone, the diameter of the medullary cavity, cortical thickness, total proximal-to-distal length, soft tissue thickness at three regions along the bone, and bone density expressed both as pixel values on radiographs and Hounsfield units on CT.

The headline finding is a stark demonstration of how much conventional radiography can mislead. On plain films, the medullary cavity of the humerus appeared to average 7.32 millimetres in diameter, while CT revealed the true figure to be just 5.67 millimetres. Cortical thickness told the mirror-image story: radiography suggested a cortex of only about 1.06 millimetres, whereas CT measured it at 1.86 millimetres, nearly 75 percent thicker. The explanation lies in the fundamental physics of projection radiography. Because an X-ray compresses a three-dimensional structure into a two-dimensional image, overlapping anatomical structures blur the boundary between dense cortical bone and the air-filled cavity within, systematically overestimating the medullary space and underestimating the cortex. For a surgeon planning fracture repair, that difference is not academic; it determines implant selection and the feasibility of intramedullary pinning.

Not every measurement diverged. The cranio-caudal diameter of the bone itself, around 9.4 millimetres by CT and 9.46 millimetres by radiography, showed only a negligible difference between the two techniques, and this was the one parameter where the comparison did not reach statistical significance. But for medullary cavity diameter, cortical thickness, total bone length, and soft tissue thickness at the proximal, middle and distal regions, the differences between modalities were all statistically significant, with CT consistently delivering the more precise values. Total humeral length, for instance, measured 140.68 millimetres on radiographs but 132.84 millimetres on CT, a discrepancy the authors attribute to the magnification and superimposition inherent in two-dimensional projection imaging.

Perhaps the most biologically intriguing numbers came from the density measurements. On CT, the cortex registered approximately 822 Hounsfield units, the medullary cavity around negative 805 Hounsfield units, and the surrounding soft tissue about 66 Hounsfield units, with no meaningful difference between the right and left wings for any parameter. The medullary value is the giveaway: a strongly negative Hounsfield reading indicates air, confirming the extensive pneumatisation that defines the avian humerus. In birds, the humerus is not filled with marrow in the mammalian sense but with air-filled cavities connected to the respiratory system, an adaptation that lightens the skeleton for flight and assists in respiration and air humidification. The researchers note that a Hounsfield value of 800 plus or minus 50 in the cortex reflects the degree of this pneumatisation, and the symmetry between wings suggests a tightly regulated developmental programme.

That pneumatisation is a double-edged sword. By hollowing the bone, evolution has made pneumatic bones more prone to shattering and fragmenting on impact, and the distal extremities of the humerus lack substantial soft tissue protection, leaving them vulnerable to open, comminuted fractures that are notoriously difficult to repair. Fractures of pneumatic bones, particularly the femur, can even trigger respiratory complications when the injury is open. This is precisely why an accurate anatomical baseline matters. The CT-derived reference values now published for Buteo rufinus, including cortical thickness, medullary diameter, total length and regional soft tissue measurements, give veterinarians a species-specific yardstick against which traumatic injuries can be assessed and surgical plans drawn.

The findings dovetail with a growing body of comparative work. Previous tomographic studies of common buzzards and peregrine falcons documented significant interspecies variation in bone density, cortical thickness and trabecular architecture, suggesting that structural resilience in raptors is closely tied to anatomical adaptation to the demands of flight. Other researchers have used calibrated CT to quantify the avian centre of mass and inertia tensor for biomechanical flight modelling, while anatomical atlases combining CT with cross-sections have supplied reference values for parrots and other species. Studies of roadside hawks have similarly combined radiography and CT with three-dimensional digital modelling to map long-bone anatomy, an approach that improves diagnostic precision and supports surgical planning and post-injury rehabilitation. Even archaeology has benefited, with multi-resolution CT and deep-learning image segmentation now used to identify bird species in Egyptian animal mummies, a testament to how versatile the technology has become.

For the long-legged buzzard itself, the practical implications are immediate. As apex predators and indicators of local biodiversity, these birds occupy dry and semi-dry steppes, grasslands, desert margins, hills and mountains, and every individual successfully returned to the wild after fracture treatment represents a small conservation victory. The study’s authors conclude that while digital radiography remains a valuable first-line tool yielding useful data on humeral indices, CT scanning is the superior diagnostic instrument, its high-resolution three-dimensional views enabling precise structural assessment that directly informs targeted treatment plans and rehabilitation protocols. In a field where the difference between flight and permanent grounding can hinge on fractions of a millimetre of cortical bone, that precision may prove decisive for the raptors of Kerman and beyond.

Subject of Research: Comparative diagnostic imaging of humerus bone structure in the long-legged buzzard using radiography and computed tomography

Article Title: Diagnostic Imaging Analysis of Humerus Bone Structure in Long‐Legged Buzzard (Buteo rufinus): Radiology and CT‐Scan Insights

Article References: Alinejad, N., Esmailinejad, M. R., Shafiei, H., & Jahedi, M. (2026). Diagnostic Imaging Analysis of Humerus Bone Structure in Long‐Legged Buzzard ( Buteo rufinus ): Radiology and CT‐Scan Insights. Veterinary Medicine and Science, 12(6), Article e71233. https://doi.org/10.1002/vms3.71233

Image Credits: AI Generated

DOI: 10.1002/vms3.71233

Keywords: long-legged buzzard, Buteo rufinus, computed tomography, digital radiography, humerus, avian skeletal pneumatisation, raptor medicine, fracture diagnosis, veterinary imaging, wildlife rehabilitation, Hounsfield units, cortical bone thickness