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Fig. 1C. —50-year-old man with purulent ventriculitis after resection of cerebellar hemangioblastoma and ventricular shunt placement. Tensor diffusion-weighted MR image (4000/110; b value, 1000 m²/sec) shows pus in dependent position of occipital horns and marked hyperintense signal (arrows) compared with cerebrospinal fluid and brain.