1病例介绍患者,女,35岁,主诉为左前臂疼痛4年余。临床检查:左前臂相当于尺桡骨中段可扪及一巨大肿块,活动度欠佳。X线片显示左尺骨中段多发骨质破坏,中央膨大呈泡沫样改变,未见明显骨膜反应,周围软组织肿胀明显,却未见明显界限清楚的软组织肿块影。左桡骨受压变形弯曲,但未见明 1 case description The patient, female, 35 years old, complained of left forearm pain more than 4 years. Clinical examination: the left forearm is equivalent to palpable mass in the middle of radius and ulna, with poor activity. X-ray showed that the middle of the left ulnar multiple bone destruction, the central swelling showed a foam-like changes, no significant periosteal reaction, obvious swelling of the surrounding soft tissue, but no clear boundary clearly clear soft tissue mass. Left radius compression deformation bending, but no clear