Nonaneurysmal Subarachnoid Hemorrhage

Findings:
SAH in prepontine cistern- normal 4 vessel angio (only vertebrals shown)

Differential Diagnosis:
aneurysm, trauma, nonaneurysmal SAH

Discussion:
criteria- no intraventricular blood, should not extend into anterior interhemispheric fissure, not beyond medial third of sylvian fissure, confined to posterior portion of suprasellar cistern/ambient cistern. etiology thought to be spontaneous hemorrhage from small veins in pontine or perimesencephalic regions.

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