抄録
Synovial osteochondromatosis occurring in the subacromial bursa has seldom been reported. We found only 6 cases in a recent survey, and would like to report another.
A 70-year-old female had acute pain in her shoulder without any preceding trauma. Roentgenograms and a computed tomographic scan of her shoulder revealed many oval calcified loose bodies packed into the subdeltoid space, which had caused an indentation at the proximal humerus.
At surgical exploration a sack which contained many cartilagenous loose bodies was found between the deltoid muscle and the humerus. The humerus was indented at the portion beneath the sack. At the top of the greater tubercle was a large cartilagenous loose body of 2 cm in diameter accompained by a flat ossified plate beneath it. Histological survey indentif ied the sack as a bursa filled with osteochondral free bodies, but the origin of the plate remains unknown.
