Version July 2025
| Synovial cyst or ganglion |
| Septic arthritis (eg, staph, tuberculosis) |
| Crystal arthropathy (gout, pseudogout) |
| Inflammatory arthritis (rheumatoid arthritis, Crohns enteropathic arthritis) |
| Synovial disorders (chondromatosis) |
| Distal clavicular and acromial tumors |
| Os acromiale syndrome |
| Intra-articular fractures of the distal clavicle or acromion |
