A Rare Cause of Developmental Discrepancy in a Dizygotic Twin Pregnancy: Giant Chorangioma

Chorioangioma is a benign tumor of the placenta showing similar histologic pattern with hemangiomas. We aimed to present a 9x8x4 cm sized chorioangioma causing twin to twin transfusion like syndrome in a dizygotic twin pregnancy. A 30 weeks old dichorionic-diamniotic twin pregnancy with a 7x5 cm hypo-echoic mass at the placental site of one fetus who revealed a normal development, and the other having intrauterine growth retardation, was admitted to our clinic. Preeclampsia was developed in clinical follow-up at 34th weeks of pregnancy and emergency cesarean section was performed due to fetal distress. Chorioangioma was detected on the placenta of the normal fetus. Pathologic examination of placenta revealed a 9x8x4 cm mass macroscopically with a diagnosis of chorioangioma microscopically. Chorioangiomas may cause twin to twin transfusion like syndrome in dizygotic twins and may result in various spectrum of problems in fetus depending on the size and the texture.