PMC5828557_01
(a) Prenatal axial ultrasound shows the skull shape aberrancy and the presence of vermian agenesis with communication between the 4th ventricle and the cisterna magna (depicted by arrow). (b) Postnatal MRI was significant for hypogenesis of the inferior cerebellar vermis with mild fourth ventricular enlargement which communicates with a retrocerebellar CSF collection.
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fig1
Complete sonographic examination at 21-week gestation identified multiple abnormalities, including partial vermian agenesis (formerly referred to as Dandy-Walker variant), hypoplastic nasal bone, choroid-plexus cysts, and dangling choroid (Figure 1(a)). MRI, performed on day two of life, was consistent with partial vermian agenesis and showed hypogenesis of inferior cerebellar vermis with mild fourth ventricular enlargement which communicated with a retrocerebellar cerebrospinal fluid collection (Figure 1(b)).