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Types of Brain Aneurysms

There are four main types of brain aneurysms. Most aneurysms occur where an artery branches, often at the base of the brain. The treatment options vary, depending on the type of aneurysm, its size, and its location.

Brain viewed from bottom showing brain stem, cerebellum, and arteries. Closeup of brain with two connected arteries on surface showing saccular aneurysm with neck ballooning out from artery wall where two arteries connect. Closeup of artery with fusiform aneurysm bulging out from all sides of artery. Fusiform aneurysm rarely has neck. Closeup of artery with giant aneurysm over 2.5 centimeters wide. Giant aneurysm can involve more than one artery. Closeup of mycotic aneurysm caused by infected artery wall. Mycotic aneurysm fairly rare.

Online Medical Reviewer: Fetterman, Anne, RN, BSN
Online Medical Reviewer: newMentor board-certified, academically affiliated clinician
Date Last Reviewed: 9/8/2013
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