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, centred 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 oedema. 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.