Preoperative and postoperative radiographs of patient 2. (A) A preoperative radiograph indicated an expansile, multiseptated lucent lesion in the fibula. (B) A good union and alignment had been obtained at 8 weeks postoperation. (C) At 4.5 months follow-up after surgery, the lesion recurred with multiple small irregular lucencies. At postoperative 2 years (D) and 4.5 years (E) of follow-up, these small lucencies gradually fused into a long, expansile lesion and appeared progressive over time.