[Epidermoid cyst of the testis: a case of testis preservation].

A 19-year-old man complained of an asymptomatic right testicular mass. Physical examination revealed a firm, small-finger sized, mass lesion with a smooth surface in the right testis. The ultrasonographic appearance was hypoechoic and well-demarcated intratesticular lesion. All laboratory investigations, including tumor markers, were normal. The testis was explored through an inguinal incision. The mass was excised locally and the biopsy of the adjacent testicular tissue was done with gentle code clamping. The histological diagnosis was epidermoid cyst of the testis and the testicular tissue obtained was normal. About 90 cases of testicular epidermoid cyst have been reported in the Japanese literature, and are reviewed briefly here.