Subarachnoid hemorrhage - perimesencephalic
Sudden onset of headache. No loss of consciousness and no focal neurological deficits.
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CT of the brain demonstrates subarachnoid blood located predominantly in the interpeduncular and prepontine cisterns.
This case illustrates the typical appearances of a perimesencephalic subarachnoid hemorrhage. As is usually the case no source of bleeding (ie no aneuryms or vascular malformation or tumor etc..) was found despite angiography and MRI.