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contentuptodate· Content· item f13_20_13633
©2013 UpToDate ® Print Email Perimesencephalic subarachnoid hemorrhage CT scan demonstrates the typical findings of a nonaneurysmal perimesencephalic subarachnoid hemorrhage. Note the predominance of hemorrhage in the interpeduncular fossa (arrow). Courtesy of Guy Rordorf, MD.