[An alpha-fetoprotein producing Sertoli-Leydig cell tumor--a case report].

A case of an ovarian, poorly differentiated, Sertoli-Leydig cell tumor in a 55-year-old woman is reported. The patient showed no virilization, but did show elevated serum alpha-fetoprotein (AFP) levels. The tumor, measuring 70 x 45 x 50 mm, consisted mainly of a diffuse proliferation of spindle cells. Among this proliferation, some tubules of Sertoli cells and groups of leydig cells were found. Immunoperoxidase studies, using anti-AFP, localized the AFP in the leydig cells.