Posterior fossa malformations: sonographic diagnosis and postnatal outcomes

Objective: To assess the perinatal outcome of fetuses presenting with a posterior fossa anomaly remains a challenge due to the great variety of the malformations and their nomenclature. Study Design: 43 fetuses detected between 2001–2006 at the University Hospital Berne with a sonographically abnormal posterior fossa were subdivided in: Group 1 (n=20) with dilatation of the fourth ventricle with hypoplasia or aplasia of the cerebellar vermis (Dandy-Walker-Complex). Group 2 (n=23) with a small posterior fossa and herniation of the cerebellum or brainstem through the foramen magnum (Chiari-Malformation II). Result…