Familial cerebral saccular aneurysm

Familial cerebral saccular aneurysm, also known as familial intracranial aneurysm, is a condition characterized by the occurrence of saccular (berry) aneurysms in the blood vessels of the brain in two or more family members. Saccular aneurysms are balloon-like outpouchings that develop at branching points of cerebral arteries, most commonly in the circle of Willis at the base of the brain. These aneurysms result from weakening of the arterial wall and can remain asymptomatic for years or may rupture, leading to subarachnoid hemorrhage — a life-threatening form of stroke that causes sudden severe headache, nausea, vomiting, neck stiffness, loss of consciousness, and potentially death. The familial form accounts for approximately 7–20% of all intracranial aneurysm cases. Individuals with a first-degree relative who has had an intracranial aneurysm carry a significantly increased risk compared to the general population. The condition is genetically heterogeneous, with multiple chromosomal loci implicated, including regions on chromosomes 1p34-36, 7q11, 19q13, and others. Both genetic susceptibility and environmental risk factors such as hypertension, smoking, and excessive alcohol consumption contribute to aneurysm formation and rupture risk. Management includes screening of at-risk family members using non-invasive imaging such as magnetic resonance angiography (MRA). Unruptured aneurysms may be monitored or treated preventively through surgical clipping or endovascular coiling, depending on aneurysm size, location, and patient risk factors. Ruptured aneurysms require emergency neurosurgical intervention. Modifiable risk factors should be aggressively managed, including blood pressure control and smoking cessation. Genetic counseling is recommended for affected families to discuss screening strategies and recurrence risks.

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