RESUMEN
Virilization in female newborns as a result of an ovarian mass known as luteoma of pregnancy is a rare condition. A case of a maternal pregnancy luteoma responsible for virilization of both newborn and mother is reported. Luteoma of pregnancy, first described by Sternberg in 1963, is usually asymptomatic and is discovered incidentally during a cesarean section or postpartum tubal ligation. To date, fewer than 200 cases have been reported in the literature. This report describes a case of a virilized pregnant woman first seen in active labor who eventually underwent cesarean section for arrest of descent. Intraoperative findings showed a well circumscribed, pedunculated mass attached to the left ovary. A healthy baby girl was born with masculinization of the external genitalia.