Urinary bladder endometriosis: a report of two cases.

Endometriosis of the urinary tract is uncommon, and the most common site of involvement is urinary bladder. Two cases of endometriosis of urinary bladder are presented. The first patient, a 39-year-old woman, complained of dysuria during menstruation and the other 37-year-old woman suffered from intermittent gross hematuria. Pre-operative examinations included ultrasonography, computed tomography and cystoscopic biopsy. Case 1 was in premenopausal status, but the serum estrogen level of case 2 was in postmenopausal status because she was given no exogenous estrogen after previous bilateral salpingo-oophorectomy. Endometriosis of urinary bladder rarely occurs in postmenopausal woman without exogenous estrogen replacement. Case 1 received danazole treatment after transurethral resection of bladder tumor and case 2 received partial cystectomy after transurethral resection of bladder tumor. The patients were followed 36 and 4 months, respectively, and the symptoms kept improving during this period.