OBJECTIVE: A critical review of the literature on the incidence, presentation, diagnosis, and prognosis of perimesencephalic nonaneurysmal subarachnoid hemorrhage. METHODS: Review of the relevant literature. CONCLUSION: The importance of early computed tomography (<3 d), anatomy of the perimesencephalic and neighboring cisterns, and adequate four-vessel angiography are discussed. Treatment strategies, including the avoidance of repeated angiographic studies and surgical exploration, are presented.
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Schwartz et al. (1996) studied this question.