Conclusion: Acute hydrocephalus, post ventricular drain insertion. Combination of osseous, leptomeningeal and subependymal enhancing lesions.
Perimesencephalic leptomeningeal enhancement and enhancement along the cranial nerves in the prepontine and cerebellopontine angle cisterns. At the vertex there is sulcal FLAIR hyperintensity. Small foci of nodular enhancement related to the left foramen of Luschka, which is completely obliterated.
Interval placement of right frontal approach ventricular drain. Periventricular T2/ FLAIR hyperintensity most likely represents transependymal CSF leakage. The cerebral aqueduct appears widely patent and there is a normal T2 flow void which implies patency.
An enhancing abnormality within the clivus and extending into the right occipital condyle and left petrous apex and petroclival junction.