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These patients elaborate on the clinical spectrum of subarachnoid hemorrhage with a perimesencephalic pattern.First,a negative exploratory craniotomy suggests that the source of nonaneurysmal perimesencephalic hemorrhage may not be arterial.Second,nonaneurysmal perimesenencephalic hemorrhage may also occur in children.Finally,the index of suspicion for a posterior circulation aneurysm should remain high in patients who present with a perimesenencephalic pattern of subarachnoid hemorrhage,and these aneurysms may rise from unusual locations. |
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