陰嚢肉様膜から発生した単発性陰部平滑筋腫の1例 - 本邦報告例の検討 -

Abstract

43歳男.患者は約17年前から陰嚢左側下極に小腫瘤を自覚していた.腫瘤は精巣, 精巣上体, 精索とは無関係に存在しており, 血液検査および尿検査では異常は認められなかった.陰嚢皮下組織由来の良性腫瘍と診断し, 局所麻酔下に腫瘍茎の基部で切断して皮膚とともに腫瘍を摘出した.その結果, 腫瘍は肉様膜と連続しており, 被膜は不明瞭であった.腫瘍細胞は平滑筋の分化を認め, H-E染色で淡紅色に染まり, 種々の方向に錯綜する索状配列を呈していた.以上より, 肉様膜から発生した単発性陰部平滑筋腫と診断し, 現在まで再発の徴候は認められず, 外来にて経過観察中である

We report a case of solitary genital leiomyoma arising from the tunica dartos of the scrotum. A 43-year-old man complained of a slightly tender left scrotal mass that had enlarged over approximately 17 years. On physical examination, the tumor was pedunculate and attached to the lower pole of the left scrotum. The tumor was clearly separate from scrotal contents such as the testis, epididymis, and spermatic cord. Ultrasonography showed the tumor to be 20.0 X 23.5 mm in diameter. Other laboratory examination findings were normal. Under local anesthesia, the tumor was resected at its base with overlying skin. On histopathological examination, the tumor consisted of interlacing bundles of smooth muscle cells, which were positive for vimentin, desmin, and a-actin. The tumor was diagnosed as leiomyoma arising from the scrotal tunica dartos. As solitary genital leiomyoma of the tunica dartos is rare, we have presented this case history and reviewed 23 cases that occurred in Japan.