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MRI of Internal Impingement of the Shoulder

Eddie L. Giaroli1, Nancy M. Major1 and Laurence D. Higgins1

1 Department of Radiology, Duke University Medical Center, Box 3808, Durham, NC 27710.



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  		Fig. 1 —20-year-old man with supraspinatus tendinosis. Oblique coronal fast spin-echo T2-weighted MR image shows supraspinatus tendon has increased signal near its insertion on greater tuberosity (arrow). Cystic changes are incidentally noted in humeral head.

 


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  		Fig. 2 —20-year-old man with infraspinatus tendinosis. Oblique coronal fast spin-echo T2-weighted MR image shows infraspinatus tendon has increased signal near it insertion on greater tuberosity (arrow). Cystic changes are incidentally noted in humeral head near attachment of infraspinatus tendon.

 


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  		Fig. 3 —17-year-old girl in abduction external rotation. Fat-suppressed proton density image shows infraspinatus being impinged by posterosuperior glenoid labrum (arrow).

 


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  		Fig. 4 —20-year-old man with cystic changes in humeral head. Axial fast spin-echo T2-weighted MR image shows cystic changes in posterosuperior humeral head near attachment sites of supraspinatus and infraspinatus tendons (arrow).

 


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  		Fig. 5 —20-year-old man with abnormal posterior glenoid labrum. Axial fast spin-echo T2-weighted MR image shows posterior labrum has abnormal signal and morphology (arrow). Normally, labrum should maintain decreased T2 signal and be shape of triangle.

 


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  		Fig. 6A —20-year-old man. MRI shows significant improvement in humeral head cystic changes after patient underwent corrective surgery for internal impingement. Axial fast spin-echo T2-weighted preoperative MR image shows prominent cystic changes in humeral head near attachment sites of supraspinatus and infraspinatus tendons (arrow).

 


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  		Fig. 6B —20-year-old man. MRI shows significant improvement in humeral head cystic changes after patient underwent corrective surgery for internal impingement. Axial fast spin-echo T2-weighted postoperative MR image shows nearly complete resolution of humeral head cystic changes (arrow).

 

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