ABSTRACT
Eosinophilic cystitis is characterized by an eosinophilic infiltration usually of all layers of the bladder wall, ranges from a mild form of cystitis to a chronic recurrent relentless inflammation which even may progress to the point of damaging the upper urinary tracts with deterioration of the renal function. The etiology remains unclear, and there is no specific therapy available. The tumoral form of eosinophilic cystitis is a rare phenomenon and characterized by an extensive bladder wall infiltration, that may clinically imitate an invasive bladder cancer. We report a case of eosinophilic cystitis appeared to be an invasive bladder cancer extending to the pelvic side wall in a 37-year-old female, who was treated with transurethral resection.