There is a large heterogenous mass lesion in the floor of the 4th ventricle, predominantly iso-low T1, high on T2, with heterogenous but vivid enhancement. The lesion appears to extend through the foramen of Luschka (both sides) and Magendie. There is upstream obstructive moderate hydrocephalus due to the mass, with mild transependymal speak of CSF.
Interpretation: Features are highly likely representing forth ventricular ependymoma. DDx: choroid plexus papilloma, atypical meningioma, and subependyoma. All though very unlikely.