Early ultrasonographic diagnosis of placental mesenchymal dysplasia.

Placental mesenchymal dysplasia (PMD) is a rare pathology characterized by vascular anomalies, placentomegaly and grapelike vesicles resembling partial molar pregnancy. PMD is often associated with fetal growth restriction or intrauterine fetal demise. We report a case of an early diagnosis of PMD at 10 weeks' gestation, with a regular intrauterine growth and a fetal demise occurring at 31 week's gestation. The placenta showed aneurysmally dilated and tortuous vessels with luminal thrombosis. Even in presence of a regular fetal growth, a fetal demise may always occur, suggesting the option of an early heparin administration to reduce the risk of thrombosis of chorionic vessels.