ANEURYSM AS A CAUSE OF STROKE

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Abstract
Aneurysms may produce sufficient spasm to cause angiographic nonfilling of an intracranial artery. We believe this nonfilling to be due to thrombosis but the actual cause of the nonfilling is difficult to prove without histologic examination. If the spasm proceeds slowly enough, collateral flow to the ischemic area may develop from the leptomeningeal vessel to a sufficient degree to prevent cerebral infarction. The neuroradiologist plays a vital role in demonstrating these fine collateral flow patterns and alerting the neurosurgeon to their presence.

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