骨旁骨肉瘤是骨肉瘤的一种特殊类型,其恶性程度较一般骨肉瘤低,截肢后效果较好。我院1964年6月至1981年4月,收治住院并经手术及病理证实的7例骨旁骨肉瘤,术前均误诊。本组7例中,男3例,女4例。年龄19～33岁。肉瘤部位,股骨远端4例(其中3例膝关节活动受限),股骨中段1例,胫骨近端2例。7例均有不同程度疼痛,5例有局部肿胀。骨旁骨肉瘤起源于骨膜或骨旁结缔组织,比较少见,临床易误诊。李瑞宗等 Paraosseous osteosarcoma is a special type of osteosarcoma. Its malignancy degree is lower than that of general osteosarcoma and its effect is better after amputation. In our hospital from June 1964 to April 1981, 7 cases of parasellar osteosarcoma admitted to hospital and confirmed by surgery and pathology were misdiagnosed before surgery. Of the 7 patients in this group, 3 were males and 4 were females. Age 19 to 33 years old. The sarcoma site, distal femur in 4 cases (including 3 cases of limited knee joint activity), 1 case of middle femur, 2 cases of proximal humerus. All 7 cases had varying degrees of pain and 5 cases had local swelling. Paraosseous osteosarcoma originates from the periosteum or para-lumbar connective tissue. It is rare and clinically misdiagnosed. Li Ruizong et al