Perimesencephalic subarachnoid hemorrhage
Acute onset of severe headache.
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Prepontine and right ambient cisternal subarachnoid hemorrhage.
Non-aneurysmal perimesencephalic hemorrhage is a distinct type of subarachnoid hemorrhage where the source of bleeding is venous. Blood is confined to the basal cisterns around the midbrain.
Cerebral angiogram is negative for an aneurysm.