A case of cystitis cystica presenting as a bladder mass in a boy

Cystitis cystica is a rare proliferative lesion of the bladder, usually caused by chronic irritation and inflammation. It is caused by the hyperplasia of the submucosa and proliferation of von brunn nests of the bladder. Though usually benign, it is considered to have some malignant potential. This condition has been reported in adults, but is rarer in pediatric age group. We describe the case of cystitis cystica in a 13 year-old boy who presented with painless hematuria and was suspected to be bladder neoplasm on imaging.