Suprascapular nerve entrapment with acute infraspinatous denervation myopathy
Presentation
Right shoulder pain.
Patient Data
MRI Right Shoulder
Tear of the superior aspect of the posterior labrum. Lobulated cystic formation extending about 4 cm at the level of the spinoglenoid notch with impingement on the suprascapular nerve. Increased signal intensity on PD fat-sat images suggestive of oedema at the level of the infraspinatus muscle.
No tear is noted at the level of the rotator cuff tendons.
Case Discussion
This is a case of the young male presenting with shoulder pain. The MRI study shows tear of the superior aspect of the posterior labrum with associated paralabral cyst impinging on the suprascapular nerve at the level of the spinoglenoid notch. Oedema is noted at the level of the infraspinatus muscle suggesting subacute denervation myopathy.
Suprascapular nerve entrapment occurs when the nerve is compressed at the level of the suprascapular or spinoglenoid notch. Entrapment of the suprascapular nerve at the level of the suprascapular notch may result in denervation changes in the supraspinatus and infraspinatus muscles while entrapment of the nerve at the level of the spinoglenoid notch may result in denervation changes in the infraspinatus muscle only. Subacute denervation myopathy appears as increased signal intensity on T2-weighted images due to muscle oedema. Chronic denervation myopathy appears as fatty infiltration and muscle atrophy.
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