男子後部尿道腫瘍の3例

Abstract

Three cases of the tumor of the prostatic urethra (inverted papilloma, polyp and transitional cell carcinoma) were reported. Case 1 (Inverted Papilloma): A twenty-six-year-old-man was admitted with chief complaint of hematuria. Urethrocystogram and endoscopic examination revealed a polypoid tumor on stalk arising from prostatic urethra. TUR was performed and histopathological examination showed that the tumor had the inverted configuration being covered by normal transitional epithelium. Inverted papilloma of the urethra is the rarest tumor and only 4 cases were reported in the available literature. This case is the first one in Japan. Inverted papillomas are believed to be benign in its histologic morphology and clinical behavior. But we think that this type of tumor may have malignant potency, so the patient should have subsequent follow up. Case 2 (Fibrous Polyp): A thirty-seven-year-old-man was admitted with chief complaint of dysuria. Urethrocystogram and endoscopic examination revealed a polypoid tumor on stalk arising from prostatic urethra. TUR was performed and histopathological findings showed that the tumor was composed of a fibrovascular stalk, covered by normal transitional epithelium. Fibrous polyps are beleived to be congenital in origin. However we guess that our case, as the other same cases, is acquired origin because of acute onset in adult and normal upper urinary tract. Case 3 (Transitional Cell Carcinoma): A twenty-eight-year-old-man was admitted with chief complaint of asymptomatic hematuria. Urethrocystogram and endoscopic examination revealed a papillary tumor on stalk arising from prostatic urethra. TUR was performed and histopathological examination showed that the tumor was transitional cell carcinoma grade I.