Fig. 4

The figure shows pattern D (see text) on axial MRI in a patient with NF1. Two small right cerebellar abnormal signal intensities (arrows) are seen at 8 years (a). New right and left cerebellar abnormal signal intensities (dark oblique arrows) developed at age 11 years. One of the older abnormal signal intensities is also shown (horizontal arrow) (b). The right cerebellar abnormal signal intensity increased in size (arrow) at age 13 years (c)