Environmental Mycotoxin Exposure and Pediatric Neuroimmune Dysfunction_ A Case-Informed Hypothesis Review in PANS_PANDAS

Pediatric Acute-Onset Neuropsychiatric Syndrome (PANS) and its streptococcal-associated subset PANDAS are increasingly recognized as heterogeneous neuroimmunological conditions triggered by infection, autoimmunity, and environmental stressors. While microbial and immune mechanisms have received growing scholarly attention, the potential contribution of mycotoxin exposure — specifically through sinonasal inhalation of indoor mold and translocation of fungal metabolites toward the central nervous system — remains critically underexplored in the pediatric literature. This paper is informed by direct clinical observation of a single pediatric case in which a child, observed from age 3 to age 6, sustained prolonged indoor mold exposure and subsequently received an official PANS/PANDAS diagnosis suggestive of basal ganglia encephalitis, or neuroinflammation. Laboratory analysis demonstrated measurable findings interpreted by treating clinicians as elevated relative to laboratory reference ranges — including ochratoxin A, gliotoxin, and Aspergillus-derived metabolites — that temporally coincided with a documented progression from early dermatological and gastrointestinal symptoms through escalating neuropsychiatric deterioration, including irritability, anxiety, depression, behavioral regression, loss of previously acquired language, urinary and bowel incontinence, motor tics, convulsive episodes, and progressive difficulty ambulating. Building on this observed clinical trajectory and the existing toxicological, immunological, and neurological literature, this paper proposes the hypothesis that chronic sinonasal mycotoxin exposure may represent a biologically plausible and underrecognized contributing factor in PANS/PANDAS-spectrum neuroimmune dysfunction. Mycotoxin-induced mitochondrial disruption and detoxification pathway impairment are further proposed as potential mechanisms by which affected children may develop progressive sensitization to ubiquitous environmental chemical exposures encountered in modern domestic life. These hypotheses are presented not as established causal claims but as a mechanistically grounded framework warranting rigorous controlled investigation.