Fig 6.

PCMR images in sagittal (upper row) and axial (lower row) views showing flow in one systolic and one diastolic phase of the cycle and for reference (top left) the sagittal T2-weighted image in the patient. These demonstrate more flow anterior to the cord than posterior. On careful inspection, the axial images show more flow anterolateral to the cord than posterior to it. Reproduced with permission from Hofkes SK, Iskandar BJ, Turski PA, et al. Differentiation between symptomatic Chiari I malformation and asymptomatic tonsilar ectopia by using cerebrospinal fluid flow imaging: initial estimate of imaging accuracy. Radiology 2007;245:532–40.