GEYSER SIGN

----The geyser radiographic sign on shoulder arthrogram is characterized by leakage of dye from the glenohumeral joint into the subdeltoid bursa. The dye outlines the acromioclavicular joint. It is usually an indication of a full-thickness cuff tear of long duration

-----The geyser sign is an infrequently encountered imaging sign that was originally described on conventional fluoroscopy-guided shoulder arthrography.

----- The sign derives its name from its geyser-like appearance. On imaging, owing to a full-thickness SST tear, synovial fluid or intra-articular contrast extravasates from the glenohumeral joint into the subacromial bursa. The fluid, which then passes through the AC joint into an overlying cystic mass, is said to resemble a geyser spouting upwards.

-----Passage of fluid from the glenohumeral joint into the acromioclavicular joint on arthrography is referred to as the geyser sign. It can be seen with chronic rotator cuff tendon tear or after injury of the acromial undersurface during surgery.

FROM -----MANY SOURCES