![]() T2 - Is gadolinium necessary to detect intralabyrinthine schwannomas?Ĭopyright 2018 Elsevier B.V., All rights reserved. T1 - MRI screening of the internal auditory canal These findings have implications for reducing cost, time, and adverse events associated with gadolinium administration in patients presenting with sudden or ASNHL. Conclusion: 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. The median size of the ILSs was 4.4 mm (± 2.9 mm) and most (18/31) were intracochlear in location. The 5 ILSs with discordant results were correctly identified upon consensus review. Results: 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. 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. When an ILS was identified, its location and size were recorded. Three board-certified neuroradiologists reviewed only the T2WI from these 67 cases. Methods: 31 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. The purpose of this study was to determine if non-contrast high-resolution T2WI alone are adequate to exclude these uncommon intralabyrinthine tumors. However, there are concerns that non-contrast MRI may not detect labyrinthine pathology, specifically intralabyrinthine schwannomas (ILSs). Level of evidence: 4Ībstract = "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 in patients with sudden or asymmetric sensorineural hearing loss (ASNHL). 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 in patients with sudden or asymmetric sensorineural hearing loss (ASNHL). ![]()
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