
The study described the clinical phenotype, disease outcomes, and pathological findings of a subset of patients with noninfectious cystitis, termed "progressive inflammatory cystitis" (PIC), who develop refractory symptoms marked by diffuse inflammatory changes, reduced bladder capacity, and vesicoureteral reflux (VUR). Significant findings include a median maximum bladder capacity of 80 mL, VUR in 68% of patients, and acute and chronic inflammation with eosinophils, lymphoid follicles, and mast cells in the lamina and muscularis propria. Ultimately, 78% of patients underwent urinary diversion, with a median of 4.5 years after symptom onset. The study highlights the need for larger prospective cohort studies to further characterize this severe phenotype of chronic noninfectious cystitis and guide management decisions.
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