No shinkei geka. Neurological surgery
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Cerebral vasospasm after SAH from AVMs is rare. Only few reports have been made. ⋯ This high incidence (31%) might be attributable to the timing from the last SAH attack until angiography. The existence of massive subarachnoid blood clots around the arteries of the circle of Willis is the most important factor causing vasospasm after SAH from AVMs.