Reply

R.A. Bhadelia contends that in our study we measured anterior CSF flow at a level that cannot be compared to their midsagittal measuring point immediately below the foramen magnum. Judging from their Figure 3, it was our impression that our slice position at the level of the base of the odontoid was best compared with their measuring point 2, not 3, which was distinctly lower. Beyond that, sagittal measurements are not directly comparable to our axial method, which comprises the anterior and posterior compartment as a whole. Discrepancies may be explained by the fact that midsagittal measurements leave parasagittal flow undetected.