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MR Anatomy of the Subcoracoid Bursa and the Association of Subcoracoid Effusion with Tears of the Anterior Rotator Cuff and the Rotator Interval

Andrew J. Grainger1,2, Phillip F. J. Tirman3, J. Mark Elliott1, Andrew Kingzett-Taylor1, Lynne S. Steinbach1 and Harry K. Genant1

1 Department of Radiology, University of California at San Francisco, 505 Parnassus Ave., Ste. M392, San Francisco, CA 94143-0628.
2 Present address: Department of Radiology, Freeman Hospital, High Heaton, Newcastle upon Tyne, NE7 7DN, United Kingdom.
3 San Francisco Magnetic Resonance Center, 3333 California St., San Francisco, CA 94118.



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  		Fig. 1. —Drawing shows subcoracoid space in oblique sagittal plane. Note superior subscapularis recess and subcoracoid bursa located anterior to subscapularis muscle. Also note saddlebag appearance of subscapularis recess over subscapularis muscle.

 


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  		Fig. 2. —33-year-old woman with supraspinatus tendinosis but no tear. Oblique sagittal T2-weighted MR image shows fluid-filled superior subscapularis recess (arrow). Note saddlebag appearance over subscapularis muscle (s). G = glenoid, c = coracoid process.

 


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  		Fig. 3. —56-year-old woman with supraspinatus tear. Oblique sagittal T2-weighted MR image shows caudal extent of subcoracoid bursa (arrows) as it tracks deep in relation to coracobrachialis and biceps tendon (short head) (t). c = coracoid process.

 


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  		Fig. 4A. —53-year-old woman with rotator cuff tear. Oblique coronal T2-weighted MR image (with fat saturation) (A) and oblique sagittal T2-weighted MR image (B) show full thickness tear of supraspinatus. Tear involves rotator interval (arrowheads). Note accompanying subcoracoid bursa effusion seen in B (curved arrow).

 


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  		Fig. 4B. —53-year-old woman with rotator cuff tear. Oblique coronal T2-weighted MR image (with fat saturation) (A) and oblique sagittal T2-weighted MR image (B) show full thickness tear of supraspinatus. Tear involves rotator interval (arrowheads). Note accompanying subcoracoid bursa effusion seen in B (curved arrow).

 


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  		Fig. 4C. —53-year-old woman with rotator cuff tear. Oblique sagittal T2-weighted MR image medial to B shows distended subcoracoid bursa. Note septa (arrow) in bursa.

 


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  		Fig. 5. —61-year-old woman with supraspinatus tear and effusions of subcoracoid (curved arrow) and subacromial (straight arrow) bursae. Oblique sagittal T2-weighted MR image shows communication between two bursae.

 

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