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Brain aneurysm

brain aneurysm (AN-yoo-riz-um) is a bulge or ballooning in a blood vessel in the brain. It often looks like a berry hanging on a stem. A brain aneurysm can leak or rupture, causing bleeding into the brain (hemorrhagic stroke).

An unruptured aneurysm usually causes no symptoms. A key symptom of a ruptured aneurysm is a sudden, severe headache.
Treatments for an unruptured aneurysm include medication to control blood pressure and procedures to prevent a future rupture. Emergency medical care is required for a ruptured aneurysm.