Case 1, image 1: This 23-year-old man died of multiple gunshot wounds.
Case 1, image 2: Sections of the cerebellar vermis with incidental arteriovenous malformation and subarachnoid hemorrhage.
Vascular malformations of the brain include arteriovenous malformations, cavernous angiomas, capillary telangiectasia, and venous angiomas. Histologically, AVMs are characterized by thick-walled arteries and veins separated by gliotic brain tissue.
Individuals may be asymptomatic or present with acute hemorrhage.