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Width of High Signal and Extension Posterior to Biceps Tendon as Signs of Superior Labrum Anterior to Posterior Tears on MRI and MR Arthrography

Department of Radiology, E3/311, University of Wisconsin Medical School, 600 Highland Ave., Madison, WI 53792.

View larger version (115K): [in a new window]   Fig. 1 —65-year-old man with normal superior recess and minimal degenerative fraying of superior labrum at surgery. Maximum width of high signal between superior labrum (arrow) and glenoid rim occurred at articular surface and measured 2.0 mm (arrowheads) on this oblique coronal fat-suppressed fast spin-echo T2-weighted conventional MR image. Patient had full-thickness rotator cuff tear confirmed at surgery.

View larger version (159K): [in a new window]   Fig. 2A —34-year-old man with type 2 superior labrum anterior to posterior (SLAP) tear at surgery. Two adjacent oblique coronal fat-suppressed fast spin-echo T2-weighted conventional MR images show high signal extending into superior labrum (arrows). Greatest width, 3.1 mm (arrowheads, A), was obtained at focal widening of high signal on more posterior image (A).

View larger version (158K): [in a new window]   Fig. 2B —34-year-old man with type 2 superior labrum anterior to posterior (SLAP) tear at surgery. Two adjacent oblique coronal fat-suppressed fast spin-echo T2-weighted conventional MR images show high signal extending into superior labrum (arrows). Greatest width, 3.1 mm (arrowheads, A), was obtained at focal widening of high signal on more posterior image (A).

View larger version (103K): [in a new window]   Fig. 3 —20-year-old man with normal superior recess at surgery. Mild focal widening of increased signal between labrum and glenoid rim several millimeters above articular surface is seen on this oblique coronal fat-suppressed T1-weighted MR arthrogram. Area of increased signal was thought to be distinct from hyaline cartilage (arrow). Width measured 2.4 mm (arrowheads).

View larger version (100K): [in a new window]   Fig. 4 —29-year-old woman with type 2 superior labrum anterior to posterior (SLAP) tear at surgery. Width of high-signal line measured 3.2 mm (arrowheads) on this oblique coronal fat-suppressed T1-weighted MR arthrogram. Portion of high signal has a laterally curved branch (lateral arrowhead); a SLAP tear was interpreted on original MR image.

View larger version (139K): [in a new window]   Fig. 5A —39-year-old man with normal superior recess and minimal degenerative fraying of superior labrum at surgery. Two consecutive oblique coronal fat-suppressed fast spin-echo T2-weighted conventional MR images show smooth medially curved high signal (arrows) between superior labrum and cartilage at top of glenoid rim (arrowheads). Image A is one section posterior to image B.

View larger version (138K): [in a new window]   Fig. 5B —39-year-old man with normal superior recess and minimal degenerative fraying of superior labrum at surgery. Two consecutive oblique coronal fat-suppressed fast spin-echo T2-weighted conventional MR images show smooth medially curved high signal (arrows) between superior labrum and cartilage at top of glenoid rim (arrowheads). Image A is one section posterior to image B.

View larger version (127K): [in a new window]   Fig. 5C —39-year-old man with normal superior recess and minimal degenerative fraying of superior labrum at surgery. Screen capture from PACS workstation shows localization (curved arrows) of image A (posterior) on an axial image through upper glenoid fossa. Oblique coronal section is posterior to portion of superior glenoid rim included on axial image.

View larger version (126K): [in a new window]   Fig. 5D —39-year-old man with normal superior recess and minimal degenerative fraying of superior labrum at surgery. Screen capture from adjacent more superior axial image shows localization (curved arrows) of image B ("Mid") and a portion of long head of biceps tendon (straight arrow). Back of long head of biceps tendon at insertion onto labrum is indicated with arrowhead. Full-thickness rotator cuff tear was confirmed at surgery.

View larger version (97K): [in a new window]   Fig. 6A —20-year-old man with normal superior recess at surgery. Oblique coronal fat-suppressed T1-weighted MR arthrogram shows medially curved high signal (arrow) between labrum and glenoid rim.

View larger version (101K): [in a new window]   Fig. 6B —20-year-old man with normal superior recess at surgery. Screen capture from PACS workstation shows localization (curved arrow) of image A on axial image through top of glenoid rim. Anterior portion of long head of biceps tendon (solid straight arrow) and posterior aspect of tendon at its insertion onto labrum (arrowhead) are shown. High-signal diluted gadolinium contrast material is also seen in recess on axial image (broken arrow).

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