On head<unk>  scan, medulloblastoma is characterized by a hyperdense mass arising from the cerebellar vermis,  effacement of the fourth ventricle, and dilated ventricles due to  obstructive hydrocephalus.
Medulloblastoma CT
Neurofibroma CT
Medulloblastoma MRI
Ependymoma CT
Germinoma CT
Neurofibroma MRI
Subependymal giant cell astrocytoma CT
Oligoastrocytoma CT