患者　男性 ,3 8岁 ,汉族。七年前因车祸致右胫骨下段开放性骨折 ,两月后痊愈。四年前无明显诱因在其原骨折皮肤破损处 (右内踝上 2ｃｍ)发现一约 3ｃｍ× 3ｃｍ× 2ｃｍ包块 ,局部皮肤红肿 ,有不适感 ,疼痛轻 ,未经任何治疗而症状缓解。其后类似症状反复发作 ,两年前包块自行 Male patient, 38 years old, Han nationality. Seven years ago due to an accident caused by open fractures of the right lower tibia, two months after healed. Four years ago, there was no obvious incentive to find a 3cm × 3cm × 2cm mass in the original fractured skin (2cm on the right medial malleolus). The local skin was red and swollen with discomfort and pain. The symptoms were relieved without any treatment. Repeated episodes of similar symptoms later, two years ago mass