Case presentation A pregnant 21-year-old gravida 2 para 0 woman had a pelvic-fetal magnetic resonance imaging (MRI) because of sonographic detection of a fetal abdominal mass. The MRI was performed at 38 weeks of gestation and demonstrated a complex large right-sided abdominopelvic mass (Figure 1). The child was delivered by normal vaginal delivery 4 days later. The child at birthweighed 3205 g and had apgars of nine both at 1 and at 5 min after delivery. An abdominal-pelvic sonogram was performed on the day of birth, which confirmed the presence of a complex abdominopelvic mass ( Figure 2). The next day,the child was taken to the operating room.
Denouement and discussionLaparotomy revealed right adnexal torsion, an infarcted right fallopian tube and ovary, and a large hemorrhagic ovarian cyst.Ovarian cysts occurring in fetuses and newborn girls are of four different types: 1 (a) benign cysts of graafian epithelial origin. These are the most common comprising 97% of fetal-neonatal ovarian cysts 2 and including simple cysts, corpus luteal cysts and cystadenomas, (b) granulosa cell tumors, (c) benign cystic teratoma and (d) mesonephroma. Ovarian graafian follicles begin to appear at the fourth month of gestation life and increase in size and number after that. The etiology of simple ovarian cyst in the neonate is not certain. However, it presumably represents disordered folliculogenesis, perhaps complicated by abnormal hormonal levels, especially excessive human chorionic gonadotropin. 1,3 An association between elevated levels of human chorionic gonadotropin and slightly increased incidence of ovarian cysts has been reported in infants of diabetic mothers.Many ovarian cysts are now detected on prenatal sonograms. They have been found in fetuses as early as 19 weeks of gestation. These cysts have varied in size from 2.5 to 10 cm in largest diameter, 4 although the maximum reported was 20 cm in The mass is cystic but contains fluid, which is darker than urine on the T2 weighted images and brighter than urine on the T1 weighted images. This might indicate a cyst complicated by intra-cystic hemorrhage.