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2Brain

• Dehydration

• Steroid use

• Chemotherapy

• Remote head injury

• Normal aging

Communicating Hydrocephalus

• Normal pressure hydrocephalus

• Meningitis

• Prior subarachnoid hemorrhage

• Venous sinus thrombosis

Obstructive Hydrocephalus

• Aqueductal stenosis

• Colloid cyst of third ventricle

• Tectal glioma

• Intraventricular tumor

Parenchymal Hemorrhage

• Hypertensive hemorrhage

• Amyloid angiopathy

• Hemorrhagic metastasis

• Herpes encephalitis

• Acute leukemia

• Arteriovenous malformation

• Aneurysm

• Contusion (in trauma)

Subarachnoid Hemorrhage

• Ruptured aneurysm

• Benign perimesencephalic hemorrhage

• Traumatic subarachnoid hemorrhage

Global Cerebral Volume Loss

• Chronic alcohol use

• Anticonvulsants (particularly cerebellar)