What Causes Cerebral Atrophy?

we have a patient with following diagnosis:

MRI imaging reveals diffuse age related cerebral atrophy with ischemic demylination/leukokoaraosis in both cerebral hemispheres and lacunar ischemic foci in bilateral gangliothalmic complexes with large confluent acute infarcts in bilateral PCA teriitories including brain stem and cerebellar hemispheres with ? normal pressure hydrocephalus



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HE WAS ADMITTED ON FRIDAY MORNING IN neuro hospital in delhi