Spinoglenoid notch ganglion cyst
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A large well-circumscribed fluid intensity T1 hypointense/T2 hyperintense cystic lesion measuring 2.5 X 2.5 (axial) X 2.8 (cc) cm is demonstrated, centered in the spino-glenoid notch, contiguous with the posterior glenoid labrum, in keeping with a paralabral cyst. This results from a focal posterior labral detachment, about 9 o'clock.
No extension of the cyst into the suprascapular notch. No supraspinatus atrophy nor edema. No rotator cuff tear. Biceps tendon enlocated and unremarkable. No AC joint abnormality. No fractures or marrow abnormality.
Conclusion: Large spino-glenoid notch paralabral cyst, likely from glenoid labrum tear. No suprascapular notch extension.
Cyst in the spinoglenoid notch typically arise from labral tear. They may lead to suprascapular nerve neuropathy.