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Quadrilateral Space Syndrome: Incidence of Imaging Findings in a Population Referred for MRI of the Shoulder

¹ Department of Radiology, Duke University Health System, Erwin Rd., Box 3808, DUMC, Durham, NC 27710.
² Current address: Spartanburg Radiological Associates, PA at 101 East Wood St., Spartanburg, SC 29303.

View larger version (186K): [in a new window]   Fig. 1A. —60-year-old man with 6 months of shoulder pain. Oblique sagittal spin-echo T1-weighted MR image without contrast agent (TR/TE, 450/20; matrix, 256 x 128; number of excitations, 2) reveals fatty atrophy of teres minor muscle (arrow) consistent with quadrilateral space syndrome.

View larger version (200K): [in a new window]   Fig. 1B. —60-year-old man with 6 months of shoulder pain. Oblique sagittal fast spin-echo T2-weighted MR image with fat suppression (3,850/63; matrix, 256 x 192; number of excitations, 2) obtained in same location as A shows that no edema is present in teres minor muscle (arrow).

View larger version (164K): [in a new window]   Fig. 2A. —51-year-old man with history of rotator cuff tear not involving teres minor muscle. Mild fatty atrophy of teres minor muscle (arrows) is present in oblique sagittal T1-weighted MR image without contrast agent (TR/TE, 566/8; matrix, 256 x 192; number of excitations, 2).

View larger version (177K): [in a new window]   Fig. 2B. —51-year-old man with history of rotator cuff tear not involving teres minor muscle. Mild edema (arrows) is present in teres minor muscle on oblique sagittal fast spin-echo T2-weighted MR image with fat suppression (4,000/90.5; matrix, 256 x 192; number of excitations, 2).

View larger version (15K): [in a new window]   Fig. 3. —Bar graph shows additional findings on MR images of patients with teres minor abnormality. GH = glenohumeral joint, SASD = subacromial subdeltoid, RC = rotator cuff, supra- = supraspinatus, infra- = infraspinatus, Degen = degenerative, AC = acromioclavicular joint.

View larger version (156K): [in a new window]   Fig. 4A. —40-year-old otherwise healthy man. Oblique sagittal spin-echo T1-weighted MR image without contrast agent (TR/TE, 500/16; matrix, 256 x 192; number of excitations, 2) reveals small posterior–inferior paralabral cyst (white arrow) and atrophy of teres minor muscle (black arrow).

View larger version (166K): [in a new window]   Fig. 4B. —40-year-old otherwise healthy man. Oblique sagittal fast spin-echo T2-weighted MR image with fat suppression (4,000/68.8; matrix, 256 x 192, number of excitations, 2) again reveals high T2-signal paralabral cyst (white arrow) and teres minor atrophy (black arrow).

View larger version (164K): [in a new window]   Fig. 4C. —40-year-old otherwise healthy man. Axial fast spin-echo T2-weighted MR image with fat suppression (4,000/75.3; matrix, 256 x 192; number of excitations, 2) reveals association of posterior cyst (arrow) with labrum.

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