Presentation
Right shoulder pain and loss of range of movement. ? rotator cuff tear
Patient Data
Large juxta-articular erosion in the bare area of the anteromedial humeral head, with smaller similar erosions in the lesser and greater tubercles. Intermediate T2 signal glenohumeral joint effusion which contains tiny bodies, suggestive of synovial hypertrophy. The effusion decompresses into the subacromial subdeltoid bursa due to a near-complete supraspinatus tear, with only a few anterior intact fibers. Mild atrophy of the supraspinatus muscle. Complete loss of the inferior glenohumeral articular cartilage with remodeling of the joint and bone marrow edema in the anteroinferior glenoid. Mild to moderate ACJ arthropathy, no definite erosions.
Case Discussion
Inflammatory arthritis, such as rheumatoid arthritis, can potentially manifest in any synovial joint. The findings of erosions and a complex effusion/bursal contents should alert the referrer to such a pathology, with the diagnosis of exclusion being infection.