====== Perimesencephalic Subarachnoid Hemorrhage Epidemiology ======

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[[Perimesencephalic subarachnoid hemorrhage]] is rare with an [[incidence]] of 0.5 in 100 000 in adults.

PMSAH represents 5-10% of all [[subarachnoid haemorrhage]]s and ~33% of all non-aneurysmal SAH.