1. Congenital or berry aneurysm – Rupture
of the aneurysm was noted. Clinically, another possibility was traumatic
subarachnoid hemorrhage due to violent hyperextension of the head and neck.
The latter is due to a tear in the vertebral/basilar arterial system. The
pattern of hemorrhage is identical to that of a ruptured berry aneurysm.
2. Congenital weakness of vessel wall at
branch points; vessel slowly dilates causing aneurysm. Hypertension may
accelerate process. When rupture occurs bleeding is into subarachnoid space.
3. Polycystic kidneys.
4. Location of bleeding - subdural with
brain contusions.
