Hydrops of placental stem villi complicated with fetal congenital adrenal hyperplasia.

The authors present a case report of hydrops of placental stem villi. Numerous small aechoic spaces were demonstrated by prenatal ultrasonography. The patient spontaneously delivered a female newborn at 26 weeks' gestation. The infant showed hypertrophied clitoris and urogenital sius, and had a normal 46, XX karyotype. Endocrinological examination revealed that 3beta-hydroxysteroid dehydrogenase deficiency caused the anomaly. To our knowledge, this is the first report that congenital genital malformation complicated the placental mesenchymal dysplasia.