Female, 27 years old, 35 weeks 2 days gestational age, with multiple fetal anomalies identified on ultrasound including fetal hydrocephalus. The posterior fossa is distended by a large cystic structure which communicates freely with the 4th ventricle. A vestigial upturned vermis is seen with hypoplasia of the remaining cerebellum. The torcular is elevated as well.The lateral ventricles are dilated measuring up to 22 mm in diameter at the level of the atria. The septum pellucidum is absent, but the corpus callosum is present and appears to be fully formed.Brain morphology and the pattern of gyral development are otherwise within expected limits for gestational age. No significant intracranial hemorrhage is suspected.Although imaging was tailored for assessment of intracranial structures, numerous thoraco-abdominal anomalies are visualized incidentally. This includes a defect in the abdominal wall which contains nearly the entire liver and gallbladder, as well as the stomach, and part of the bowel. The thorax is small and appears to contain only a small amount of lung tissue on each side. The pharyngeal airway is patent and communicates with a patent trachea. A scoliotic curvature of the spine is seen which may in part be due to fetal lie.
1.Findings compatible with classic Dandy-Walker malformation.2.Ventriculomegaly which is a known association with Dandy-Walker malformation.3.Absence of the septum pellucidum, but with an intact corpus callosum.4.Multiple thoraco-abdominal anomalies including omphalocele containing liver, stomach and bowel, and suspected pulmonary hypoplasia.