Metabolic Warning Signs Emerge for Fungal Ball Sinusitis in Perimenopausal Women

A stubborn sinus infection that refuses to respond to antibiotics may not be a bacterial problem at all. In operating rooms across China, surgeons are increasingly encountering fungal ball sinusitis, a condition in which a dense, clay-like mass of fungal hyphae accumulates inside a single sinus cavity. The disease was once considered a rare curiosity of rhinology, but clinicians have noticed two striking patterns: case numbers are climbing year after year, and the patients filling their clinics are overwhelmingly middle-aged women. A new retrospective study from the Affiliated Hospital of Southwest Medical University in Luzhou now points to an unexpected contributor hiding in routine blood work, suggesting that the metabolic shifts of midlife may help open the door to this fungal invasion.

The research, published in Frontiers in Allergy, examined perimenopausal women aged 45 to 60 years and compared them against patients with chronic non-fungal sinusitis, a control group that shares many symptoms but lacks the fungal mass at the heart of the disease. The team focused on two metabolic markers that have become central to modern cardiovascular and endocrine research: high-density lipoprotein cholesterol, the so-called good cholesterol, and a composite index known as TyG-BMI, which combines the triglyceride-glucose index with body mass index to capture insulin resistance and overall metabolic burden. Both markers are inexpensive to measure, which makes any association with a fungal sinus disease immediately interesting from a screening standpoint.

Fungal ball sinusitis, sometimes called fungus ball or aspergilloma of the paranasal sinuses, belongs to the non-invasive category of fungal sinus disease. Unlike invasive fungal infections that threaten immunocompromised patients, a fungal ball grows slowly within a blocked sinus cavity, forming a compact tangle of hyphae that surgeons must physically remove. The condition typically affects one sinus, most often the maxillary sinus, and produces chronic nasal obstruction, foul discharge, facial pressure and, in some cases, the sensation of a foreign body deep in the cheek. Because its symptoms mimic ordinary chronic rhinosinusitis, diagnosis frequently arrives only when computed tomography reveals characteristic calcifications or when the removed tissue is examined under a microscope.

The study design was straightforward but carefully targeted. The researchers enrolled fungal ball sinusitis patients treated at their single center between 2015 and 2025, then narrowed the analysis to perimenopausal women aged 45 to 60, using patients with chronic non-fungal sinusitis as the comparison group. Biochemical indicators were compared between the two groups, participants were sorted into quartiles based on their TyG-BMI values, and logistic regression models were used to identify which factors independently predicted fungal ball disease. Receiver operating characteristic curves, a standard tool for judging diagnostic performance, were then applied to test whether the metabolic markers could actually predict the condition.

The demographic findings alone tell a compelling story. Across the decade of cases, fungal ball sinusitis showed a steadily increasing trend, and the patient population skewed heavily toward middle-aged and elderly individuals. Women made up 63.96 percent of cases compared with 36.04 percent of men, and the peak age of female illness clustered tightly between 45 and 60 years, precisely the window of perimenopause. This concentration is exactly the kind of pattern that makes researchers suspect hormonal and metabolic mechanisms rather than simple exposure, since perimenopause is accompanied by falling estrogen levels, redistribution of body fat, rising insulin resistance and deteriorating lipid profiles.

When the researchers compared blood values between the two groups, the differences were clear. Women with fungal ball sinusitis had significantly lower HDL cholesterol levels and significantly higher TyG and TyG-BMI values than women with chronic non-fungal sinusitis. The relationship held up in a dose-response pattern: as TyG-BMI quartiles rose, HDL cholesterol fell progressively, and the prevalence of fungal ball sinusitis climbed in step. In statistical terms, the trend was significant at P less than 0.05, meaning the probability that these gradients arose by chance is small.

The logistic regression analysis then isolated the two markers as independent risk factors, each holding its predictive power after accounting for the other. Higher HDL cholesterol was protective: each unit increase was associated with an odds ratio of 0.482, with a 95 percent confidence interval of 0.282 to 0.823 and a P value of 0.008, meaning women with better HDL levels had roughly half the odds of fungal ball disease. Higher TyG-BMI, by contrast, carried risk, with an odds ratio of 1.192 per quartile step, a 95 percent confidence interval of 1.008 to 1.409 and a P value of 0.04. In plain language, the more insulin-resistant and metabolically burdened a woman was, the more likely she was to harbor a fungal ball in her sinuses, and the healthier her cholesterol profile, the lower that likelihood became.

One finding deserves careful interpretation. When the researchers combined TyG-BMI and HDL cholesterol into a single predictive model and tested it with ROC analysis, the combined model showed only limited predictive value for fungal ball sinusitis. This means the markers are statistically associated with the disease and may illuminate its biology, but they cannot yet serve as a reliable diagnostic test in the clinic. Association is not prediction, and a screening tool built on these numbers would miss too many cases and flag too many healthy women to be useful on its own. The authors instead frame their results as a call for targeted metabolic monitoring and early intervention, positions that could plausibly lower fungal ball risk if the underlying mechanisms hold up in future work.

What might those mechanisms be? The study was observational and retrospective, so it cannot prove causation, but the biology offers several plausible threads. Insulin resistance, which TyG-BMI captures, is known to alter mucosal immunity, promote low-grade systemic inflammation and change the composition of airway secretions, all of which could make the sinus environment more hospitable to fungal colonization. HDL cholesterol, meanwhile, does far more than ferry lipids; it modulates inflammation and immune cell function, and low HDL is a recognized hallmark of metabolic syndrome. Falling estrogen during perimenopause worsens both insulin resistance and lipid profiles, which could explain why the disease concentrates in this demographic window. A clogged, inflamed, metabolically altered sinus cavity may simply be easier for ambient fungal spores to colonize and harder for the immune system to clear.

The clinical takeaway is that fungal ball sinusitis should no longer be viewed as a purely local problem of the nose. For perimenopausal women with stubborn unilateral sinus symptoms, especially those with known metabolic risk, the study suggests that clinicians may want to look at the whole metabolic picture rather than treating the sinus in isolation. The rising annual incidence recorded at this single center over ten years adds urgency, because a disease that grows quietly in midlife women is a disease that health systems will increasingly encounter. Larger multicenter prospective studies will be needed to confirm the association, test whether metabolic intervention actually reduces risk, and determine whether TyG-BMI and HDL cholesterol can eventually earn a place in clinical prediction models. For now, the message is that the sinuses and the metabolism are more connected than anyone suspected, and the blood panel drawn for a routine midlife checkup may one day help flag the women who need a closer look up their nasal passages.

Subject of Research: Metabolic risk factors for fungal ball sinusitis in perimenopausal women

Article Title: Metabolic risk factors for fungal ball sinusitis in perimenopausal women

Article References: Wang, S.-Y., Xu, W., Liu, Y.-X., Jiang, L., Xu, Y., Teng, F.-Y., Hu, X.-Y., & Li, H.-X. (2026). Metabolic risk factors for fungal ball sinusitis in perimenopausal women. Frontiers in Allergy, 7, 1900638. https://doi.org/10.3389/falgy.2026.1900638

Image Credits: AI Generated

DOI: 10.3389/falgy.2026.1900638

Keywords: fungal ball sinusitis, perimenopausal women, TyG-BMI, HDL cholesterol, insulin resistance, chronic rhinosinusitis, metabolic syndrome, Frontiers in Allergy, retrospective study, sinus disease, estrogen, logistic regression