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contentuptodate· Content· item f35_16_36098

©2013 UpToDate ® Print Email CT NPH calculation of Evans ratio The Evans ratio is the ratio of the maximal diameter of the frontal horns of the lateral ventricles (at the slice where the frontal horns are largest) to the maximum width of the cranial cavity measured at the inner tables of the skull at the same level. The modified Evan's ratio is 0.375 in this patient.