[Leiomyoma of the scrotum: a case report].

: A case of intrascrotal leiomyoma is reported. A 62-year-old male was admitted to our hospital with the chief complaint of a painless intrascrotal mass, which had been gradually increasing in size during the past 25 years. Physical examination revealed impervious to light and elastic firm mass of 5 cm in diameter in the left scrotum. Although the serum level of some tumor markers such as alpha fetoprotein and human chorionic gonadotropin-beta were normal, since the border on the left testis was unclear on the ultrasonogram of the scrotum, a testicular tumor was suspected, and radical orchiectomy was performed. The tumor was 6 x 4 x 4 cm, 55 g, and well-defined with testis, epididymis and tunica dartos. It was histopathologically diagnosed as leiomyoma arising from the tunica vaginalis. The post operative course has been uneventful for 9 months after the surgery, and no recurrence has been recognized. An intrascrotal tumor is relatively rare, and is generally defined as one arising between tunica dartos and tunica vaginalis testis, which is independent of testis, epididymis, and funiculus spermaticus. This is the 25th case of intrascrotal leiomyoma reported in the literature in Japan.