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Research ArticleHead & Neck

Diagnostic Accuracy of Screening MR Imaging Using Unenhanced Axial CISS and Coronal T2WI for Detection of Small Internal Auditory Canal Lesions

T.A. Abele, D.A. Besachio, E.P. Quigley, R.K. Gurgel, C. Shelton, H.R. Harnsberger and R.H. Wiggins
American Journal of Neuroradiology December 2014, 35 (12) 2366-2370; DOI: https://doi.org/10.3174/ajnr.A4041

Article Figures & Data

Figures

  • Fig 1.
    Fig 1.

    A 29-year-old man with hearing loss on the right. A, Axial CISS image shows subtle asymmetric hypointense signal within the fundus of the right IAC (arrow), which could be dismissed as volume averaging. B, Coronal T2WI better demonstrates the hypointense lesion (arrow) along the inferior right IAC fundus, which is confirmed to be a 4-mm enhancing mass (arrow) on postcontrast coronal T1WI (C).

  • Fig 2.
    Fig 2.

    A 65-year-old woman who presented with left-sided hearing loss. A, Coronal T2WI shows the intracanalicular bilateral vestibulocochlear and facial nerves without associated lesion. B, Axial CISS image demonstrates a hypointense lesion (arrow) to better advantage located within the fundus of the left IAC. C, Postcontrast axial T1WI confirms the enhancing 2-mm lesion (arrow).

  • Fig 3.
    Fig 3.

    A 71-year-old man with vertigo. A, Axial CISS image demonstrates a hypointense focus surrounded by a loop of the anterior inferior cerebellar artery, which was thought to represent a small IAC lesion. B, Coronal T2WI shows the same hypointense focus. C, Postcontrast axial T1WI shows no enhancing lesion, indicating that the hypointense focus on the screening study was volume averaging related to the adjacent artery.

Tables

  • Table 1:

    Diagnostic data for observer 1

    Axial CISSCoronal T2WICISS + T2WI
    Accuracy0.940.940.97
    Specificity0.96 (0.85–0.99)0.96 (0.85–0.99)0.96 (0.85–0.99)
    Sensitivity0.91 (0.70–0.98)0.91 (0.70–0.94)1.00 (0.82–1.00)

    • Note:—All data are percentage (95% CI).

  • Table 2:

    Diagnostic data for observer 2

    Axial CISSCoronal T2WICISS + T2WI
    Accuracy0.940.990.99
    Specificity0.92 (0.80–0.97)1.00 (0.94–1.00)0.98 (0.88–1.00)
    Sensitivity1.00 (0.82–1.00)0.96 (0.76–1.00)1.00 (0.82–1.00)

    • Note:—All data are percentage (95% CI).

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Diagnostic Accuracy of Screening MR Imaging Using Unenhanced Axial CISS and Coronal T2WI for Detection of Small Internal Auditory Canal Lesions
T.A. Abele, D.A. Besachio, E.P. Quigley, R.K. Gurgel, C. Shelton, H.R. Harnsberger, R.H. Wiggins
American Journal of Neuroradiology Dec 2014, 35 (12) 2366-2370; DOI: 10.3174/ajnr.A4041
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