16岁女孩，左小腿上段肿胀疼痛半年，近1个月来肿胀明显。查体：左胫骨上端肿胀严重，压痛明显，浅静脉怒张，扪及一 6Cmx7Cm硬性肿块，固定，边界不清。X线片示左胫骨上段呈虫蚀状溶骨性破坏 骨膜肥厚明显，可见Codman三角。最可能的诊断是

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