Ovarian granulosa cell 'tumorlet' and mature follicles with ectopic decidua in pregnancy--a case report.

Non-neoplastic, tumor like lesions are encountered in the ovaries during pregnancy. Of these pregnancy luteoma is the most common lesion mimicking an ovarian neoplasm. Ovarian granulosa cell proliferations are also reported in the ovaries removed during pregnancy as an incidental finding. The granulosa cell proliferation occurs due to the follicular stimulating hormone (FSH) like activity of human chorionic gonadotropin (hCG). We report a case of second gravida who developed uterine atonia, necessitating emergency hysterectomy. Right ovary showed extensive ectopic decidua, numerous well-formed follicles and granulosa cell tumor-like proliferation. Usually follicles are not formed in the ovaries during pregnancy. The same FSH like activity of hCG might have been responsible for the formation and maturation of follicles in this case.