Placental chorangioma is the most common non-trophoblastic placental tumor. The ultrasound allow antenatal diagnosis, but the diagnosis is confirmed the histopathological examination of the placenta after birth. It cause many maternal and fetal complications that are due to multiple intra-placental arteriovenous anastomoses. We report the case of a 25-year-old patient referred to our formation at the CHU Hassan II of Fez at 31 SA for a poorly tolerated polyhydramnios. Obstetrical ultrasound showed the presence of a 9cm subcutaneous chorionic mass with intra-lesional vascular flow suggestive of placental chorangioma. The fetus had subcutaneous infiltration associated with cardiomegaly. Cesarean section was decided after a course of corticotherapy. The newborn presented a favorable evolution with the appearance of multiple small hemangiomas scattered all over the body which spontaneously regressed. We have discussed through this observation the echographic characteristics of placental chorangioma, its maternal and fetal complications, and the fate of these pregnancies.