Abnormal outpouching in the wall of intracranial blood vessels. Most common are the saccular (berry) aneurysms located at branch points in circle of willis at the base of the brain. Vessel rupture results in subarachnoid hemorrhage or intracranial hemorrhages. Giant aneurysms (>2.5 cm in diameter) may compress adjacent structures, including the oculomotor nerve. (From Adams et al., Principles of neurology, 6th ed, p841)

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