Fig. 17.

a Axial HRCT of the right temporal bone in a patient with known bilateral cochlear otosclerosis. There is almost complete obliteration of the basal turn of the right cochlea (arrow) by the otosclerotic process. b Axial MRI of the temporal bones in the same patient as (17a) at the level of the cochlea. There is significant obliteration of the fluid space in the basal turn of the right cochlea (arrow). The normal fluid space in the basal turn of the left cochlea (arrowhead) is shown for comparison