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MRI of the Internal Auditory Canals

Basics: What is an MRI of the internal auditory canals?

MRI of the internal auditory canals (IACs) along with CT of the internal auditory canals are the standards of care with respect to imaging crucial structures that are involved with our hearing and balance. We perform these diagnostics on a daily basis. Our images are 0.5 mm thick on MRI and are reconstructed as a volume set and evaluated in an infinite number of planes. Our approach allows assessment the cranial nerves at the skull base including cranial nerves II through cranial nerve XII. We also evaluate for tumors, infection and inflammatory processes involving these structures. Tiny vascular loops, which can cause a number of problems in these areas, are also well visualized.

MRI of the internal auditory canals, is always obtained with and without contrast. It includes ultra high resolution (0.5 mm) axial and coronal T2/CISS weighted images through the bilateral internal auditory canals, as well as pre and post contrast axial and coronal weighted ultrathin (2 mm) T1 images. MRI IAC with and without contrast is used to evaluate tumors, soft tissue masses, vascular loops, inflammation, infection, and structural or developmental abnormalities. Usually, patients who complain of dizziness, balance issues, tinnitus, and/or hearing loss may benefit from the results of an MRI of the internal auditory canals.

Discussion of images above:

The study above is of an individual who complained of hearing a loud pulsatile sound in his right ear. The etiology was demonstrated to be a small cyst causing narrowing of a major draining vein right by his right ear.

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