Luteoma of pregnancy masquerading as a granulosa cell tumor.

Pregnancy luteomas are rare, nonmalignant lesions thought to be caused by hormonal changes during pregnancy. Granulosa cell tumor is a rare type of ovarian cancer; 10% occur during pregnancy and typically present with elevated inhibin levels. Herein, we present a case of a pregnant female with a pelvic mass and elevated inhibin B suggestive of a granulosa cell tumor, yet with final pathology consistent with a pregnancy luteoma.