Presentation
A Patient with a history of obesity. She came to the emergency department for sudden onset headache, with nausea and vomiting.
Patient Data
Age: 60 years
Gender: Female
From the case:
Perimesencephalic subarachnoid haemorrhage
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A Hyperdensity surrounding the pons, midbrain and basal cisterns, which corresponds to acute subarachnoid haemorrhage.
CTA rules out the presence of aneurysms.
Case Discussion
The CT findings are consistent with Perimesenchephalic subarachnoid haemorrhage.
Perimesenchephalic subarachnoid haemorrhage represents 5-10% of all SAHs. Most have a normal CTA (as in this case), so the aetiology is thought to be bleeding of venous origin.
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