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nan12010-sup-0001-si.avi3786K

Video S1. Time-lapse images of contrast medium in the fourth ventricle, lateral recesses and splenial sulci show a pulsation effect. This was due to variable sizes of these compartments being imaged at different stages of the natural pulsation of the brain (90–100/min), which were out of phase with the 1-s intervals at which images were recorded. The video is at twice the speed at which images were recorded.

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