The Journal of Bone and Joint Surgery 79:1085-88 (1997)
© 1997 The Journal of Bone and Joint Surgery, Inc.
Bursal Osteochondromatosis Overlying an Osteochondroma of a Rib. A Case Report*
JOHN M. WRIGHT, M.D. ,
ERIC MATAYOSHI, M.D. and
ALAN P. GOLDSTEIN, M.D. , HONOLULU, HAWAII
Investigation performed at Kaiser Permanente, Honolulu
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Introduction
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Synovial chondromatosis is a rare, benign, pathological condition characterized by the production and intra-articular extrusion of cartilaginous nodules by metaplastic synovial tissue. These bodies often undergo endochondral ossificationhence the term synovial osteochondromatosis. The disease is idiopathic and appears as a monoarticular arthropathy of a diarthrodial joint, particularly the knee8.
Extra-articular lesions have been reported, but they are even rarer than their intra-articular counterparts. In these instances, the chondrometaplasia occurs in tenosynovial or bursal tissue and almost exclusively in the hands and feet9,11,14,16,20,22,26,27.
This report describes a case of bursal osteochondromatosis arising within an adventitious bursa over an osteochondroma of a rib. This phenomenon can mimic a malignant tumor and cause clinical confusion.
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Case Report
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A twenty-eight-year-old, right-hand-dominant male construction worker had a mass on the posterior portion of the right shoulder. The mass was painless and had gradually increased in size over a two-year period. The medical history was unremarkable . . . [Full Text of this Article]

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K. Ishida, R. Kuroda, K. Sato, T. Iguchi, M. Doita, M. Kurosaka, and T. Yamamoto
Infrapatellar Bursal Osteochondromatosis Associated with Unresolved Osgood-Schlatter Disease. A Case Report
J. Bone Joint Surg. Am.,
December 1, 2005;
87(12):
2780 - 2783.
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