We evaluated the signal intensity of the CSF on low b-value (b=500 s/mm2) diffusion weighted images (DWI) in cases with ventricular dilatation versus controls by a scoring method. Although low b-value DWI cannot quantify the absolute flow speed, it may be possible to evaluate the distribution of altered CSF dynamics within the cranium in the cases of ventricular dilatation. We also evaluated the characteristic signal void findings adjacent to the septum pellucidum in the cases with ventricular dilatation, which was speculated to be due to a standing wave in a thinned septum pellucidum.
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