Figure 10b. Cochlear dysplasia. (a) Axial CT scan of the left temporal bone shows incomplete partition (Mondini dysplasia) of the middle and apical cochlear turns (arrow). (b) Axial CT scan of the right temporal bone shows more severe cochlear dysplasia (black arrow) with associated vestibular and semicircular canal anomalies (white arrow). (c) Axial CT scan demonstrates a cochlea with a normal middle and apical turn (arrow) for comparison.