Moebius syndrome. Sagittal oblique CISS sequence of the internal auditory canal in a patient with Moebius syndrome (a) demonstrates the small caliber of the hypoplastic facial nerve in the anterior superior aspect of the canal (arrow). The normal vestibulocochlear nerve is seen posteriorly (double lined arrow). Sagittal oblique CISS image in a normal patient (b) demonstrates the normal caliber of the facial (solid arrow) and vestibulocochlear (double lined arrow) nerves for comparison.
