Microvascular occlusion clamps off the artery leading to an aneurysm. This prevents bleeding and rupture. Sometimes a bypass procedure is done as well, rerouting blood vessels to healthy areas of the brain. A portion of the skull is removed (called a craniotomy) and restored during this complex, open surgery.

Microvascular occlusion often treats a brain aneurysm that has ruptured and caused damage to the artery.

Brain Aneurysm
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An aneurysm is a weakened blood vessel in the brain that collects blood. The bulging, blood-filled pocket can put pressure on parts of the brain, pressing on nearby nerves. This can cause symptoms or cause the blood vessel to rupture (hemorrhage).
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It will not fix damaged areas of the brain, but it can improve quality of life by stopping bleeding or preventing rupture.