Male, 38 years old, with history of communicating hydrocephalus and deterioration of gait. Reassess ventricular size. Findings compatible with a classic Dandy-Walker malformation are again seen. This includes a large posterior fossa cyst which communicates with the fourth ventricle and which expands the posterior fossa with torcular lambdoid inversion. The vermis is small and up-turned and the cerebellar hemispheres are hypoplastic. There has been no significant interval change in these findings, and in particular, the posterior fossa cyst has not increased in size. Also noted is a small cleft which partially traverses the right upper spinal cord, also appearing similar to prior.A left parietal approach ventricular shunt catheter is in stable position traversing the left lateral ventricular body. An orphaned right parietal approach catheter is also redemonstrated in stable position. The lateral ventricles and the third ventricle are decompressed similar to prior.Thinning of the mid body of the corpus callosum is again seen along with T2 hyperintensity within the adjacent white matter, unchanged. No new areas of parenchymal signal abnormality are seen. No acute intracranial hemorrhage is seen. No evidence of restricted diffusion is detected.
1. Stable findings related to classic Dandy-Walker malformation.2. Stable shunted ventricular system with decompressed supratentorial ventricles.3. No new or acute intracranial abnormalities.