"type 1: in advanced acromioclavicular joint arthritis without rotator cuff tear from degenerative changes in the acromioclavicular joint irritating the synovium, with overproduction of fluid and subsequent formation of superficial cysts at the joint"
"type 2: in chronic rotator cuff tear with superior migration of the humeral head, resulting in irritation and deterioration of the acromioclavicular joint capsule, increased synovial fluid production causes glenohumeral joint fluid to leak into the communicating AC joint to produce cysts (Geyser sign)"
"T2: hyperintense fluid tracks from the glenohumeral joint space across subacromial bursa and into AC joint 3"
"After injection of arthrogram solution into the glenohumeral joint, the solution will decompress and extend into the subacromial-subdeltoid bursa (through the cuff tear) and into the AC joint, the so-called geyser sign 1."
Expected headings
"Fluroscopy"
"There is often a high-riding humeral head abutting the undersurface of the acromion or acromioclavicular joint, indicating rotator cuff tears. There may also be signs of rotator cuff tear arthropathy."