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In page Synovial osteochondromatosis:

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Typical finding is of multiple, smooth, oval-shaped calcified masses within the joint space or bursa. They have a characteristic popcorn-ball appearance of calcified cartilage. With serial imaging, masses may be found to change in size, disappear, or migrate to recessed areas of the joint. They may pass from the main joint cavity into a neighboring synovial cyst. For this reason, a mass may not be appreciated within the actual joint space itself.[citation needed]