Figure 1: (A) CT scan showing agenesis of cerebellar vermis, large posterior fossa cyst communicating with the fourth ventricle suggestive of Dandy-Walker malformation (left) and thinning of the occipital bone (right). (B): magnetic resonance imaging, T2 sagittal view (left) and T2 Flair axial view (right), showing agenesis of cerebellar vermis and large cerebrospinal-fluid filled cyst in the posterior fossa that is confluent with the fourth ventricle without hydrocephalus