Non-aneurysmal perimesencephalic SAH
50 year old male presenting with acute onset severe headache .
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Prepontine and right ambient cisternal SAH.
Non-aneurysmal perimesencephalic haemorrhage is a distinct type of subarachnoid haemorrhage where the source of bleeding is venous. Blood is confined to the basal cisterns around the midbrain.
Cerebral angiogram is negative for a aneurysm.