患者，男，33岁，因右外踝部肿胀疼痛1．5年，近日加重收入我院骨科。体检：右外踝处高起，肿胀，触及电4.0cm×3．0cm肿物，质韧，局部轻压疼，边界清楚。局部皮肤无红热。表面皮肤无静脉怒张，无色素沉着。实验室检查无特殊。X线表现：右胖骨下端外侧局限性偏心膨用性囊状骨 The patient, male, 33 years old, suffered from swelling and pain in the right lateral malleolus for 1.5 years. He has recently increased the income of orthopaedics in our hospital. Physical examination: The right lateral malleolus was swollen and swollen. It touched an electric 4.0 cm x 3.0 cm mass, was tough, and was locally lightly pressed and had a clear boundary. There is no red heat on the skin. There was no venous engorgement on the surface of the skin and no pigmentation. No special laboratory tests. X-ray findings: Limiting eccentric lateral cystic bone