Perimesencephalic subarachnoid hemorrhage

Case contributed by Dr Saqba Farooq


Acute onset of severe headache

Patient Data

Age: 50 years
Gender: Male

Note: This case has been tagged as "legacy" as it no longer meets image preparation and/or other case publication guidelines.

Prepontine and right ambient cisternal subarachnoid hemorrhage.

Case Discussion

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.

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