Dysplastic Inverted Papillomaの1例 -その臨床的対処について-

Abstract

A case of inverted papilloma of the prostatic urethra was reported. A 57-year-old man was admitted with chief complaints of hematuria and dysuria. Urethrocystogram, double contrast cystogram 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 and partially there were nuclear abnormalities and a few mitotic figures. These findings corresponded to a transitional cell papillary carcinoma, grade I -II. But, presently, inverted typed malignant tumor, which have been rarely reported, is not established as a pathological nor clinical entity. Consequently, we diagnosed this case as "dysplastic inverted papilloma", and decided to follow up closely. In future, the criteria for malignant and benign inverted papillary tumor based on abundant experience like this case should be established.