Perimesencephalic subarachnoid haemorrhage
Sudden onset of headache. No loss of consciousness or neurological deficit.
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Blood is seen in the perimesencephalic cistern.
2 case question available
This is the typical distribution of perimesencephalic subarachnoid hemorrhage, which usually is non-aneurysmal in origin.
This patient went on to have a CTA which demonstrated no evidence of an aneurysm. They were further evaluated with DSA and followup and he has remained well.