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Hereditary multiple osteochondromatosis (HMO)is characterized by multiple osteochondroma (OC) arising from enchondrally formed bones. Such lesions are seen most commonly in the forearm, knee and hip j...oint. In long bones,OC arises adjacent to the physis and tends to remain in the metaphyseal legion. Therefore,it is rare that OC is located intra-articular of the joint and only few cases of intra-articular OC have been previously reported. Intra-articular OC could appear as a single loose body in a joint cavity. Thus,other joint disorders,such as osteochondritis dissecans should be ruled out in such cases. We herein report a case with an intra-articular OC in a knee joint cavity in the patient with HMO. 遺伝性多発性外骨腫症は,前腕,膝,股関節周囲などに多発する骨軟骨腫を特徴とする疾患である.多くの症例で,骨軟骨腫は長管骨の骨幹端近傍に存在し,関節内発生例の報告は少ない.今回,骨軟骨腫を膝関節内に発生した遺伝性多発性外骨腫症の希な1例を経験したため報告する.続きを見る
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