Bilateral ovarian well-differentiated Sertoli-Leydig cell tumors with heterologous elements associated with unilateral serous cystadenoma--a case report.

Bilateral Sertoli-Leydig cell tumors (SLCTs) of the ovary, especially in association with a cystadenoma, are exceedingly rare. Some SLCTs, usually of poor differentiation, show heterologous elements. We present a case of a 61-year-old woman with bilateral well-differentiated SLCTs in which the Sertoli-Leydig cell component showed leiomyogenic (heterologous) differentiation. Furthermore, on the left side it also was associated with a serous cystadenoma.