Abstract
A twenty-two-year-old man presented with metachronous bilateral chondroblastoma of the proximal part of the femur with a pathologic fracture. The pathologic fracture on the right side was treated with tumor resection and total hip arthroplasty. Within forty-three months, the chondroblastoma in the left femoral head was detected and treated with the same protocol as the chondroblastoma on the right side. No metastatic lesion was evident at this time; because of its benign appearance histologically, the lesion was diagnosed as a metachronous lesion. In a patient who has been previously diagnosed with and treated for chondroblastoma, skeletal pain at another site may represent a metachronous lesion.
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