Juxta-articular Bone Cyst
Juxta-articular bone cyst is an intraosseous nonneoplastic subchondral cystic lesion not related to joint pathology – especially osteoarthritis. The lesion contains mucoid fluid and is lined by fibrous tissue with myxoid change. If the joint presents osteoarthritis, the lesion is defined as a degenerative subchondral pseudocyst. Male predominance. Adults, more frequently – 80 % – between the third and sixth decade of life. Predilection for bones adjacent to hip, knee, ankle, wrist, and shoulder joints. Roentgenograms show a well-outlined oval or round osteolytic radiolucent lesion, frequently located eccentrically, in close relationship to the subchondral layer in the epiphysis of a long tubular bone. Histologically the cyst is surrounded by a connective tissue membrane with scarce number of fibroblasts and parallel fascicles of collagen fibers and lacks an evident synovial layer. Foci of myxoid transformation in the connective membrane. Stellate cells and abundant mucoid substance. Painful cysts are treated with curettage and bone grafting.
KeywordsPseudotumor Bone Cyst Articular Rheumatoid Degenerative
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