Perimesenchephalic subarachnoid hemorrhage

Case contributed by Dr Chris O'Donnell


Sudden onset of severe headache with neck stiffness following exercise. No reduced consciousness.

Patient Data

Age: 18 years
Gender: Male

Non-contrast CT followed by CT angiogram C of W

Subarachnoid hemorrhage predominately in the interpeduncular and ambient cisterns extending down into the pre-pontine and perimedullary cisterns especially on the right. No blood above the tentorium. CTA is normal without berry aneurysm or other vascular anomaly.

Case Discussion

An important diagnosis as associated with an excellent prognosis. Bleeding thought to be of venous origin from the extensive perimesenchephlic venous plexus.

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Case information

rID: 28978
Published: 24th Apr 2014
Last edited: 14th Aug 2019
Inclusion in quiz mode: Included

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