A different type of aneurysm can occur at the base of the brain. The arteries at this site may have a develop¬mental defect and form small berry-like aneurysms that may remain asymptomatic until a rupture occurs when the individual is between 20 and 50 years old. A subarach-noid hemorrhage at the base of the brain may damage the brain substance and cause coma, death, or severe disability.
These aneurysms may cause sudden intense headaches. Berry aneurysms are not related to high blood pressure, but coexisting hypertension may predispose them to rupture. Patients with coarctation of the aorta or polycystic kidney disease may have coexisting berry aneurysms, and these individuals and family members should be screened with MRI. Fortunately, these aneurysms can be surgically clipped off prior to their rupture. A beta-blocking drug is useful during the perioperative period.
BIBLIOGRAPHY
Al-Omran, M., Verma, S., Lindsay, T. F., Richard, D., Weisel, Sternbach, Y.
et al. Clinical decision making for endovascular repair of abdominal
aortic aneurysm. Circulation, 110:e517–e523, 2004. Brady, A. R., Thompson, S. G., Greenhalgh, R. M. et al. Cardiovascular
risk factors and, abdominal aortic aneurysm expansion: Only smoking

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