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16-year-old male diagnosed with Ewing's sarcoma of the right proximal ulna presented after receiving neoadjuvant chemotherapy with radiographs (a) and MRI (b). He underwent an intercalary through the olecranon resection and reconstruction (c) with extracorporeal irradiation of resected segment. At latest follow-up of 42 months, there is no evidence of joint arthritis (d) or disease recurrence. Both osteotomy junctions have healed, and patient has excellent function (e).
