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From top left to lower right, PCMR images of 6 of 14 successive phases in a cardiac cycle in a patient with asymptomatic Chiari I malformation and no evidence of jets. The arrows demonstrate the subarachnoid space. The CSF flow changes during these 6 phases go from a negative direction (upper 3 images) to a positive direction (lower 3 images). At no time in the cardiac cycle are large jets evident.
