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A 33 year-old woman developed the lightening onset of an explosive headache followed by nausea and vomiting.
(Left) Axial CT Scan, (Right) Left internal carotid artery angiogram, lateral - oblique view. On the CT scan, note the subarachnoid blood in the sulci and posterior horns of the lateral ventricles. Most of the blood, however, is in the interhemispheric fissure anteriorly. On the internal carotid angiogram, the source of the bleeding is clearly seen - there is an anterior cerebral artery aneurysm.
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