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Subarachnoid hyperattenuation due to hemorrhage in a 64-year-old man. A, There are foci of sulcal hyperattenuation (arrows) on the SE image. B, No corresponding hyperattenuation is seen on the iodine overlay image. C, VNC image shows identical foci of sulcal hyperattenuation, suggesting subarachnoid hemorrhage that was confirmed by the 24-hour follow-up NCCT (D).
