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患者男性,26岁,农民,左膝后方无痛性肿块6年余,肿块增大、疼痛2个月。2年前同侧小腿因“骨髓炎”在外院手术。局部无外伤史。体检:一般情况良好。左膝后内方有一鸭蛋大小硬块,不活动,轻度压痛,皮肤色温正常、屈膝活动受限。实验室检查:除碱性磷酸酶偏高(15.5金氏单位)外,无异常发现。X线检查胸部、脊椎、骨盆摄片均无异常发现。左膝常规及深曝光片显示。股骨下端后内侧丹旁呈无结构、致密骨性分叶团块约9.5×5cm,其边缘有数个小结节凸向软组织,轮廓光滑,被推移软组织的肌间隙清楚。瘤体中下部密度呈不均匀减低,并以密度高的宽基底附着于骨皮质,局部皮质、髓腔呈边缘模糊之破坏区,无骨膜反应,关节面正常。胫骨上段骨
The patient was a 26-year-old man with a painless mass behind the left knee for more than 6 years. The mass was enlarged and the pain was 2 months. Two years ago, the same side leg was operated on in the hospital because of osteomyelitis. No history of local trauma. Physical examination: Generally good. After the left knee, there was a lump of duck eggs, inactive, mild tenderness, normal skin color temperature, and limited knee flexion. Laboratory tests: No abnormalities were found except for high alkaline phosphatase (15.5 jin units). X-ray examination of the chest, spine, pelvic radiography were no abnormal findings. Left knee conventional and deep exposure display. The posterior medial flank of the femur showed an unstructured, dense bony lobule mass of approximately 9.5 x 5 cm. Several nodules protruded from the edge of the femur to the soft tissue. The contours were smooth, and the muscle clearance of the soft tissue was clearly clear. The density of the lower middle part of the tumor was unevenly reduced, and was attached to the cortical bone with a wide base of high density. The cortical and medullary cavity was in the destruction zone with blurred edges. There was no periosteal reaction, and the articular surface was normal. Upper humerus bone