患者男,56岁。左膝关节不适6个月,腘窝肿块6个月余。患者自觉肿块逐渐增大且出现胀感,无明显疼痛。体检:腘窝上部少隆起,可触及约8.0 cm的肿物,较固定,与股骨相连,触之实性感,无压痛,表面皮肤无异常。实验室检查无异常。影像表现:X线平片股骨远端示低密度破坏区,边缘可见明显硬化缘(图1、2)。CT示股骨远端“地图”状骨破坏 Male patient, 56 years old. Left knee joint discomfort for 6 months, popliteal mass more than 6 months. Conscious patients gradually increased mass swelling and swelling, no obvious pain. Physical examination: popliteal less uplift, can reach about 8.0 cm of the tumor, more fixed, connected with the femur, touch the real sexy, no tenderness, no abnormal skin surface. No abnormal laboratory tests. Imaging: X-ray showed distal femur low-density destruction of the area, the edge of the visible sclerosis (Figure 1,2). CT showed distal femur “map ” bone destruction