3.8 of 54 Ratings
A 32-year-old patient presents with persistent right shoulder pain and weakness over the past 5 months. He is a professional baseball pitcher and has well-developed shoulder and arm musculature. Pain is reproducible with associated weakness upon resisted shoulder external rotation when abducted to 90 degrees. His imaging is shown in Figures A-C. Which muscle(s) is/are affected and what is the most likely etiology?
Supraspinatus and infraspinatus; suprascapular nerve compression at the suprascapular notch
Supscapularis; traction neurapraxia on the upper subscapular nerve
Infraspinatus; suprascapular nerve compression at the spinoglenoid notch
Teres minor; axillary nerve compression at the quadrilateral space
Infraspinatus; tendinopathy at the greater tuberosity insertion
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A 24-year-old patient complains of vague right shoulder pain. On physical exam the patient is noted to have weakness with external rotation. EMG findings are consistent with quadrilateral space syndrome. Along with the deltoid, what other muscle is affected?
A professional baseball pitcher develops shoulder pain, weakness and lateral arm paresthesias in his throwing arm. Selected MRI images of the right shoulder are shown in Figures A and B. What is the diagnosis?
Long thoracic neuritis
Quadrilateral space syndrome
An MRI of the shoulder in a patient with chronic quadrilateral space syndrome is most likely to show which of the following?
Increased intra-capsular volume
Loss of intra-capsular volume
Fatty atrophy of the infraspinatus
Fatty atrophy of the teres minor
Fatty atrophy of the latissimus dorsi