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A fairly defined left C/P angle isodense mass lesion is seen. It shows homogenous enhancement in post contrast study. It is surrounded by significant low attenuation vasogenic edema. Both the mass and surrounding edema exerts mass effect in the form of compression of the 4th ventricle & compression of the nearby brain stem and vital structures. Consequent supratentroial hydrocephalus is seen with periventricular transependymal CSF permeation a type of cerebral oedema .