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- W1999120716 abstract "To determine the effect of the magic-angle effect on the MR signal in the posterosuperior portion of the glenoid labrum.MR imaging of 15 arthroscopically evaluated shoulders, five with posterosuperior labrum injury and ten intact, was retrospectively reviewed. In the first part of the study, the signal intensity of the posterosuperior labrum on gradient-recalled echo (GRE) T2*-weighted axial images was correlated with the arthroscopy findings. The second part of the study was designed to illustrate the orientation-dependent signal that occurs in the posterosuperior labrum of three asymptomatic volunteers when imaged in the conventional supine position and in a position similar to Trendelenburg's. Another three volunteers were examined with GRE T2*-weighted axial images to assess the echo-time (TE)-dependent signal in the labrum.The signal increase in the posterosuperior labrum was identified not only in the injured labra but also in nine of 10 intact labra. In the volunteers' studies, the signal in the posterosuperior labrum changed according to the examinees' positions (conventional supine or similar to Trendelenburg's) and according to TE.Increased signal intensity due to the magic-angle effect may be misdiagnosed as a labrum injury. Awareness of this pitfall is particularly important in MR imaging of throwing athletes whose posterosuperior labra are frequently injured by posterosuperior glenoid impingement." @default.
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- W1999120716 date "2002-01-01" @default.
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- W1999120716 title "Increased Signal Intensity in the Normal Glenoid Labrum in MR Imaging: Diagnostic Pitfalls Caused by the Magic-angle Effect" @default.
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- W1999120716 doi "https://doi.org/10.2463/mrms.1.149" @default.
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