Prenatal diagnosis of a large subchorionic placental cyst with intracystic hematomas. A case report.

A large intrauterine cyst containing a heterogenous mass was found by ultrasound in the placenta of a 35-year-old gravida 2 para 1 woman. The cyst, measuring 10.9 x 10.1 cm with a heterogenous mass shadow, was attached near the placental cord insertion site. The woman delivered a healthy female baby weighing 3,330 g by cesarean section without complication. A histopathological examination revealed that the lesion was a subchorionic cyst and contained an internal hematoma. Large subchorionic cysts are extremely rare, and secondary hemorrhage within the cyst has not been reported. In this article, we report the case of a woman with a large subchorionic cyst complicated by an intracystic hematoma and review its clinical significance.