[A case of malignant Sertoli cell tumor of the testis]

A 74-year-old man consulted our hospital about a painless swelling of the right scrotal contents. Laboratory findings showed no abnormalities. A right high orchiectomy was performed. The tumor measured 4.2 X 6.0 cm in size and was yellow-white in color. Histologically, the tumor was diagnosed as a malignant Sertoli cell tumor on the basis of findings of invasion and a high mitosis rate. Combined chemotherapy was performed after the operation and no recurrence was found. The Sertoli cell tumor of the testis is a rare neoplasm, and its malignant type is extremely rare. In Japan, 7 cases have been reported, and only 2 of them have been malignant. This case is the 3rd instance malignant Sertoli cell tumor in this country.