Presentation
Posterior right shoulder vague pain without trauma.
Patient Data
Large multiloculated spinoglenoid cyst in the spinoglenoid notch that extending into the joint cavity contiguous with the posterior-superior glenoid where there is a labral lesion (h 11). The spinoglenoid cyst causes a bony defect in the posterior glenoid. The bulk of the rotator cuff muscles is normal. There is also a bursal-sided partial-thickness tear of the supraspinatus tendon.
Coronal T1 fat-saturated image post direct arthrogram shows intra-articular contrast, large paralabral cyst in the spinoglenoid notch (red arrow) and a thin track of communication between the labral tear and paralabral cyst (yellow arrow).
Case Discussion
Spinoglenoid cyst is a ganglion arising in the spinoglenoid notch often related to SLAP lesion. The association of these cysts with SLAP lesions is formed by a valve mechanism, where the synovial fluid passes through the torn labrum and accumulates to form a cyst. Bony erosion caused by cyst compression may be remodeled after cyst resolution. The paralabral ganglion cysts are most frequently reported along the posterior and superior aspects of the glenohumeral joint and are uncommon anteriorly and inferiorly to the joint. Paralabral cysts emanating from posterosuperior labral tears may compress the suprascapular nerve and induce neuropathy. Symptomatic cysts require surgical treatment.
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