Fig 2.

Axial 3D cisternographic (DRIVE) fast-recovery TSE MR image of the right temporal bone in a patient with a prospectively diagnosed IP-II anomaly. A, Reformatted images parallel to the lateral semicircular canal (LSC) are created. Once created, the lateral semicircular canal is seen in its entirety on a single reformatted image. Note the enlarged vestibular aqueduct. B, The osseous spiral lamina–basilar membrane complex of the upper basal turn (OSL-BM) and the first T2-hypointense linear band (arrow), in this case representing a band of dysplastic osseous spiral lamina–basilar membrane neural complex, are demonstrated. C, A caliper is then placed to measure the distance between the OSL-BM and the linear band (distance X).