 There is no definite cortex above the bilateral superior semicircular canals which can be seen in the setting of superior canal dehiscence. Images of the internal auditory canals demonstrate the seventh and eighth nerves to be normal in size and symmetric bilaterally without masses or enhancing lesions along the course of these nerves or in the cerebellopontine angle cisterns bilaterally. The inner ear structures are normal in appearance and symmetric bilaterally without congenital inner ear anomalies identified on either side. There are no vascular anomalies. Fluid is present within right mastoid air cells.
1.There is no definite cortex above the bilateral superior semicircular canals which can be seen in the setting of superior canal dehiscence, although MRI is relatively insensitive for characterization of this cortex compared to CT. If there is clinical suspicion for superior canal presence, a temporal bone CT would be recommended for confirmation.2.Otherwise negative contrast enhanced MRI of the internal auditory canals.3.Fluid is present within right mastoid air cells.