Presentation
Shoulder pain with a difficulty of movement
Patient Data
A large well-circumscribed lobulated fluid intensity T1 hypointense/T2 hyperintense cystic lesion is seen centered on the spinoglenoid notch, contiguous with the posterior glenoid labrum and connecting to a focal posterior labral tear/detachment "paralabral cyst". The suprascapular notch appears normal. Swollen infraspinatus muscle elicits abnormal bright signal in STIR
Annotated images clarifying the study findings
Case Discussion
This case shows a posterior paralabral cyst extends to the spinoglenoid notch with subsequent suprascapular nerve entrapment that is suspected indirectly by acute denervation of the infraspinatus muscle. The cyst is seen connecting to a focal posterior labral tear/detachment suspected to be the source of this cyst. The secondary involvement of the spinoglenoid notch by a paralabral cyst differs from the primary spinoglenoid notch cyst that is a ganglion cyst.
In this case, the suprascapular notch is normal. If compressed, both supraspinatus and infraspinatus muscles will be denervated.
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