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Research ArticleHead & Neck

Enhancement in the Round Window Niche: A Potential Pitfall in High-Resolution MR Imaging of the Internal Auditory Canal

T. Brinjikji, C.M. Carr, J.C. Benson and J.I. Lane
American Journal of Neuroradiology February 2023, 44 (2) 176-179; DOI: https://doi.org/10.3174/ajnr.A7775
T. Brinjikji
aFrom the Mayo Clinic Alix School of Medicine (T.B.), Mayo Clinic Ringgold Standard Institution, Rochester, Minnesota
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C.M. Carr
bDepartment of Radiology (C.M.C., J.C.B., J.I.L.), Mayo Clinic Ringgold Standard Institution, Rochester, Minnesota
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J.C. Benson
bDepartment of Radiology (C.M.C., J.C.B., J.I.L.), Mayo Clinic Ringgold Standard Institution, Rochester, Minnesota
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J.I. Lane
bDepartment of Radiology (C.M.C., J.C.B., J.I.L.), Mayo Clinic Ringgold Standard Institution, Rochester, Minnesota
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Abstract

BACKGROUND AND PURPOSE: There is limited discussion in current literature about the normal imaging appearance of the round window. The purpose of this study was to assess the prevalence and imaging characteristics of gadolinium enhancement in the round window niche on MR imaging to the internal auditory canal.

MATERIALS AND METHODS: The presence or absence and laterality of enhancement in the round window niche on MR imaging was retrospectively reviewed in 95 patients from 1 institution. All studies included high-resolution (≤0.5-mm section thickness) pre- and postgadolinium 3D FSE T1 with fat-saturation and postgadolinium 3D FLAIR image sequences. T1 and T2 acquisitions were viewed as coregistered overlays to confirm that enhancement was lateral to the round window membrane within the round window niche. CT was reviewed when available to assess the presence and laterality of soft tissue in the round window niche.

RESULTS: Ninety-five patients with internal auditory canal MRIs were included. Enhancement was present in the round window of 15 of 95 patients (15.8%). Of the 27 patients who underwent CT, 4 (14.8%) had concordant soft tissue on CT and MR imaging enhancement in the round window niche. One patient had MR imaging enhancement within the round window niche without a corresponding abnormality on CT. The absence of soft tissue on CT and the corresponding lack of MR imaging enhancement were present in 22 (81.5%) patients.

CONCLUSIONS: Enhancement can be visualized within the round window niche on MR imaging as an incidental finding. This enhancement probably represents postinflammatory granulation tissue and does not require further intervention. However, the potential for this enhancement to be misdiagnosed as a pathologic process can be a pitfall in MR imaging.

ABBREVIATIONS:

ENT
ear, nose, and throat
FS
fat-saturation
IAC
internal auditory canal
RW
round window
RWN
round window niche
  • © 2023 by American Journal of Neuroradiology
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American Journal of Neuroradiology: 44 (2)
American Journal of Neuroradiology
Vol. 44, Issue 2
1 Feb 2023
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Enhancement in the Round Window Niche: A Potential Pitfall in High-Resolution MR Imaging of the Internal Auditory Canal
T. Brinjikji, C.M. Carr, J.C. Benson, J.I. Lane
American Journal of Neuroradiology Feb 2023, 44 (2) 176-179; DOI: 10.3174/ajnr.A7775

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Enhancement in the Round Window Niche: A Potential Pitfall in High-Resolution MR Imaging of the Internal Auditory Canal
T. Brinjikji, C.M. Carr, J.C. Benson, J.I. Lane
American Journal of Neuroradiology Feb 2023, 44 (2) 176-179; DOI: 10.3174/ajnr.A7775
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