ABSTRACT
Benigh chorioangioma of the placent is the most common primary tumor of the placenta that similar to hamartoma. Most small sized tumor is not important because it is asymptomatic and not make any clinical problem, but large tumor more than 4 cm in diameter are clinically important, because that can make hydramnios, preterm labor, fetal hydrops, Disseminated intravascular coagulopathy, intrauterine growth retardation, preeclampsia, placenta abruptio, postpartum bleeding. In this respect, the predictional diagnosis and management of chorioangioma and its complication should be done. In this paper, a case of chorioangioma associated with hydramnios, preterm labor, IUGR that diagnosis by antepastun ultrasonography and postpartum histologic study is presented with the brief review of the literature related to this type of tumor.