CT/Angiogram - Subarachnoid hemorrhage: This 63-year-old woman was brought to the ED after being found unresponsive in her apartment. She had a three-day history of a severe holocephalic headache. Examination revealed moderate nuchal rigidity, reactive mid-sized pupils and decerebrate posturing. The axial CT image on the left shows diffuse subarachnoid blood along the sulci bilaterally, within the interpeduncular cistern and along the anterior falx cerebri. The temporal horns of the lateral ventricle are enlarged and the sulci are effaced. The cerebral angiogram on the right demonstrates a saccular aneurysm emanating from the distal middle cerebral artery.