Ventriculoperitoneal-Shunt Placement for Normal-Pressure Hydrocephalus - Magnetic resonance imaging revealed ballooning of the ventricles, with an Evan’s ratio (the ratio of the width of the frontal horns of the lateral ventricles of 0.37 (Panel A). The callosal angle (Panel B, white arrow) — the angle (outlined in white) between the lateral ventricles measured at the level of the posterior commissure (black arrow) on a coronal plane perpendicular to a line between the anterior and posterior commissures — was less than 90 degrees. #Clinical #Neuro #NSG #Radiology #MRI #NPH #NormalPressureHydrocephalus #EvansRatio #CallosalAngle #NEJM