SAH is a life-threatening brain hemorrhage occurring between brain tissue layers. Most commonly caused by ruptured saccular aneurysm in brain vessel walls. Symptoms include sudden, severe thunderclap headache lasting seconds
SAH is blood extravasation into subarachnoid space between pial and arachnoid membranes. Occurs in 80% of cases from ruptured berry aneurysms. Affects 18,000 people annually in North America. Incidence peaks at age 50, with 80% occurring in 40-65 year olds
SAH is bleeding into the subarachnoid space surrounding the brain. Characterized by thunderclap headache that develops rapidly. May include vomiting, decreased consciousness, fever, and seizures. About 15% die within 30 days after aneurysm rupture
Arterial supply involves choroidal arteries and subependymal network from posterior circle of Willis. Two types: choroidal (primitive) and mural (direct fistulas). Venous drainage occurs through median prosencephalic vein. Alternative drainage routes include cavernous sinuses and ophthalmic veins
SAH is blood in subarachnoid space, affecting middle-aged patients under 60. Accounts for 3% of strokes and 5% of stroke deaths. Risk factors include family history, hypertension, and female gender
Bleeding from damaged artery at brain surface causing sudden severe headache. Blood mixes with cerebrospinal fluid, increasing brain pressure. Can cause permanent brain damage and artery spasms