Inner ear MRI is commonly used to evaluate which findings?

• A. Eustachian tube dysfunction
• B. Cochlear hair cell transduction
• C. Vestibular aqueduct abnormalities and vestibular schwannomas
• D. Otosclerosis

Answer: (C)

Inner ear MRI is used when we need to visualize the soft-tissue structures and nerves inside the temporal bone. It highlights the vestibulocochlear nerve and the fluid-filled labyrinth, making it ideal for identifying vestibular schwannomas (tumors of the eighth nerve) and abnormalities of the vestibular aqueduct. Vestibular schwannomas typically enhance with contrast and appear along the internal auditory canal or cerebellopontine angle, which MRI can clearly delineate. Enlarged or otherwise abnormal vestibular aqueducts can also be seen on MRI, reflecting congenital inner ear malformations that relate to hearing loss.

In contrast, Eustachian tube dysfunction is assessed with tympanometry and clinical examination; cochlear hair cell transduction is a physiological process rather than something imaged; and otosclerosis is best evaluated with temporal bone CT to visualize bone remodeling around the stapes and otic capsule.