Benign mucinous cystadenoma with stromal luteinization during pregnancy: a hormonally responsive tumor and a rare cause of fetal intrauterine growth restriction.

A 32-year-old woman, gravida 4, para 3, had a benign right ovarian mucinous cystadenoma. It was diagnosed 1 month before conception, measured 9 x 7cm, and reached 33 x 24 x 20cm at 38 weeks gestation. Cesarean delivery of a 2250 g normal female infant took place, and the removal of a 6300 g right ovarian cystic mass was also performed. Microscopic and immunohistochemical studies of the cyst wall revealed stromal luteinization and a strong reaction with antiserum to testosterone, estrogen and progesterone.