FIG 2. A 6-year-old boy with absence of right abducens nerve.

A, Nine-gaze photograph shows ocular versions demonstrating abduction deficit in the right eye.

B–D, Three axial MR images show the entire path of the left abducens nerve (arrows) as a linear dark structure emerging from the level of pontomedullary junction (A), coursing in the superior oblique direction (B), and finally entering into the clivus (C). The right abducens nerve is not identified.