Fig 8.

MSCT scans (A and C) obtained in a patient undergoing routine temporal-bone CT are shown for the purpose of comparison with VCT scans (B and D) of specimen 1. These scans pertain to two different temporal bones that are roughly along the same reformation plane. A and B were acquired at a plane through the superior semicircular canal (*). The VCT scan (B) clearly shows the bony covering of the superior semicircular canal and the canal of the facial nerve. Any dehiscence in these structures would be much more appreciated on the VCT scans. C and D were acquired at the Poschl plane; C was obtained with a conventional radiographic technique suitable for study of the anterior wall of the cochlea, modiolus, and the facial nerve canal; the anatomy is depicted with much greater detail on D. See Table for numbered annotations.