(middle) Acoustic neuroma (tumor) filling internal auditory canal. (top) IACS demonstrating nerves in internal auditory canal (Yellow arrow), blood vessel crossing nerves (Blue arrow) and cochlea and semi-circular canals (Green arrow). If you receive the contrast agent, the entire MRI exam will then take approximately 1 hour. The type of contrast agent we use has been validated to be one of the safest types available. We may require you to have a blood test before this procedure. The cochlear height is measured in a coronal section at an oblique angle (line). For some conditions, we may need to administer an intravenous injection of an MRI contrast agent (dye). StatPearls Publishing Treasure Island (FL): Aug 29, 2022. Proper anatomic coverage and imaging planes are important components of clinical MRI exams. A, B: Standardized measurements of the inner ear on temporal bone computed tomography. The entire MRI exam will take approximately 15 minutes. In addition, if your physician suspects a type of tumor known as a cholesteatoma, we utilize a very specialized method of imaging specific for this condition known as diffusion-weighted imaging (DWI). Your doctor may refer you for this exam to determine if there is a structural cause for hearing loss, tinnitus (ringing in the ears), dizziness or inner ear pain. We are also able to assess the inner ear structures such as the cochlea and semi-circular canals. MRI of the Internal Auditory Canals (IACs) allows visualization of the auditory and facial nerves as they pass through the internal auditory canal. There is significant variability in the position and orientation of the IAC radiographically, and the authors have noted differences in surgical exposure depending on the individual anatomy of the IAC. In these cases, an additional $300 will be charged. Background: The internal auditory canal (IAC) is an important landmark during surgery for lesions of the cerebellopontine angle. While most MRI exams of the IACs do not require contrast, there are some indications where contrast would be beneficial. MRI of the Internal Auditory Canals (IACs)
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