[Morphological reasons of development of recurrent cystitis in children].

Chronic cystitis was diagnosed in 36% of children with neuromuscular ureteral dysplasia, in 69% of those with vesicoureteral reflux, in 42% of girls with urolithiasis. Recurrent inflammation was registered in 96, 11% of patients with fibrinous cystitis and catarrhal cystitis, respectively, and in 62% of girls with bullous cystitis. Histological examination of 130 biopsies of bladder mucosa from girls with frequent recurrences of chronic cystitis provided a clear morphological picture of each endoscopic cystitis form. In bullous cystitis there are 2 congenital variants of mucosal structure: overdevelopment of lymphoid tissue as massive lymphoid follicules and lymphangioectatic form. Catarrhal cystitis is characterized by vascular angiomatosis. All the patients with fibrinous cystitis had squamous cell epithelial metaplasia. Morphological findings evidence that fibrinous cystitis is the most severe and unfavorable form of cystitis, bullous cystitis is less severe while catarrhal cystitis is favorable.