Fig. 4

Brain magnetic resonance imaging (MRI) was taken just before the operation in two achondroplasia patients who underwent ventriculoperitoneal shunt. Each was performed at 6 months (patient 1, A, B) and 35 months (patient 2, C, D) of age. Both patients showed marked dilatation of lateral and third ventricles on T2-axial (A, C) and T2-coronal (B, D) images. (A, B) Frontal horn width = 67.85 mm, Evan’s ratio = 0.51 (C, D) Frontal horn width = 61.31 mm, Evan’s ratio = 0.42