The MRI shows a heterogeneous lobulated mass lesion arising from the cerebellar vermis which causes tetra-ventricular hydrocephalus. Notice the stretching of the corpus callosum. The mass is primarily hypointense on T1WI and relatively hyperintense on long TR images with diffuse intense contrast enhancement. There is also evidence of extension through the foramen of luschka into the right medullary and cerebellopontine angle cisterns. In addition, a diffuse and relatively thick leptomeningeal enhancement is observed in the bilateral sylvian fissures, ambient , suprasellar and in the quadrigeminal cisterns.