FIG 1. High-resolution axial images of the temporal bone demonstrate correct positioning of the CI electrode proximally at the round window but then taking an abnormal course.

A, Mastoidectomy and CI electrode positioned at the round window.

B, The electrode is positioned within the vestibule.

C, At the level of the lateral semicircular canal and internal auditory canal, the electrode is seen anteriorly still within the vestibule.