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FIG. 4. A–C, Sagittal T1-weighted image (A) (550/15/1) obtained 6 hours after IV contrast administration (0.3 mmol/kg) shows the expected low-signal CSF in the cingulate sulcus (arrow). Sagittal FLAIR image (B), also obtained 6 hours after triple-dose contrast injection, shows abnormal high signal in the premedullary cistern (black arrow) as well as the cingulate sulcus (white arrow). The abnormal CSF signal on the coronal FLAIR image (C) is striking in the occipital sulci (arrows)
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