Antenatal ultrasonographic features of fetal capillary hemangioma in the posterior fossa.

A capillary hemangioma with hydrocephalus in the posterior fossa of a fetus was detected on ultrasonography at 38 weeks and 4 days of gestation. A well-defined, round tumor with a mixed pattern occupied the posterior fossa, and the normal cerebellum was significantly compressed by this tumor. No other anomaly was detected. Delivery was induced because of rapidly progressive hydrocephalus, and an otherwise healthy female infant weighing 2800 g was delivered vaginally at 39 weeks and 4 days of gestation. Histologic examination of the lesion through biopsy demonstrated capillary hemangioma. The tumor spontaneously decreased in size, and disappeared six months later. The child is now 2 years of age, and is developing normally.