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Perimesenchephalic subarachnoid hemorrhage

Case contributed by Chris O'Donnell
Diagnosis almost certain

Presentation

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

Patient Data

Age: 18 years
Gender: Male

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

NCCT followed by CTA C of W

ct

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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