Presentation
Right shoulder pain.
Patient Data
Lobulated cystic lesion at the level of the spinoglenoid notch with impingement on the suprascapular nerve. Increased signal intensity on T2 and PD fat-sat images of infraspinatus and teres minor muscles suggestive of denervation myopathy.
Case Discussion
Spinoglenoid notch ganglion cyst with suprascapular nerve entrapment with subacute infraspinatus denervation myopathy.
Entrapment of the nerve at the level of spinoglenoid notch may result in denervation changes in the infraspinatus muscle only. The supraspinatus muscle looks normal, which means that its nerve division supply is not compressed by the ganglion cyst.
Teres minor muscle shows similar changes, with no clear cause for this association as it is supplied by the axillary nerve that may be involved in quadrilateral space syndrome and not innervated by the suprascapular nerve as the infraspinatus muscle.
Subacute denervation myopathy appears as increased signal intensity on T2-weighted images due to muscle edema. Chronic denervation myopathy appears as fatty infiltration and muscle atrophy.
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