Presentation
Chronic shoulder pain. Tumor above the acromioclavicular joint.
Patient Data



Chronic full thickness defect of the supraspinatus and infraspinatus tendon with rotator cuff arthropathy.
Degeneration of the acromioclavicular joint with large amount of glenohumeral joint fluid "erupting" superiorly through the acromioclavicular interval into the subdeltoid bursa.
Case Discussion
The geyser sign is a subcutaneous pseudotumor above the acromioclavicular (AC) joint.
Synovial fluid escapes through a chronic full-thickness tear of the rotator cuff. The joint fluid "erupts" superiorly through a degenerated AC joint into the subdeltoid bursa.