Gadolinium Intralabyrinthine schwannoma Magnetic resonance imaging Sensorineural hearing loss Sudden sensorineural hearing loss.Ĭopyright © 2017 Elsevier Inc. These findings have implications for reducing cost, time, and adverse events associated with gadolinium administration in patients presenting with sudden or ASNHL. perpendicular to the plane of the internal auditory canal.7. Non-contrast high-resolution T2WI alone can detect ILSs with 84-100% sensitivity, suggesting that gadolinium may be unnecessary to exclude ILSs on screening MRI. Keywords: Sensorineural hearing loss, imaging, CT, MRI. Your experience and comfort are of key importance. The median size of the ILSs was 4.4mm (☒.9mm) and most (18/31) were intracochlear in location. Objective: Non-contrast MRI of the internal auditory canal (IAC) using high-resolution T2WI (T2 weighted image) has been proposed as the primary screening study. Some MRI examinations may require an injection of contrast material into a vein in the arm. The 5 ILSs with discordant results were correctly identified upon consensus review. The sensitivity, specificity, and accuracy were 1.0, 1.0, and 1.0 for Observer 1 0.84, 1.0, and 0.96 for Observer 2 0.90, 1.0, and 0.98 for Observer 3. MRI can be used to image the facial nerve from the brainstem to the fundus of the internal auditory canal and to determine the presence of perineural spread. Sensitivity, specificity, and accuracy were calculated using the post-contrast T1WI as the "gold standard." A consensus review of cases with discordant results was conducted. (A and B) Preoperative T1-weighted MRI with contrast depicting and. When an ILS was identified, its location and size were recorded. The facial nerve enters the internal auditory meatus, passes through the petrous part. Three board-certified neuroradiologists reviewed only the T2WI from these 67 cases. The purpose of this study was to determine if non-contrast high-resolution T2WI alone are adequate to exclude these uncommon intralabyrinthine tumors.ģ1 patients with ILSs and 36 patients without inner ear pathology that had dedicated MRI of the IAC performed with both non-contrast T2WI and post-contrast T1WI (T1 weighted image) were identified. However, there are concerns that non-contrast MRI may not detect labyrinthine pathology, specifically intralabyrinthine schwannomas (ILSs). Non-contrast MRI of the internal auditory canal (IAC) using high-resolution T2WI (T2 weighted image) has been proposed as the primary screening study in patients with sudden or asymmetric sensorineural hearing loss (ASNHL).
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