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Midline, vermis centered posterior fossa tumor bulging into the 4th ventricle, with obstructive hydrocephalus. Hemorrhage within the occipital horns of lateral ventricles due to external ventricular drains.
Tumor is heterogeneous, with cystic CSF-like densities and spontaneous hemorrhage well seen on T2*. DWI is non-contributing due to hemorrhage. No internal calcification on CT.
Round shape, no spreading through the foramen of Magendie nor the lateral foramens of Luschka.
Peripheral enhancement.