We report herein the case of a 30-year-old man who developed a primary leiomyosarcoma (LMS) 11 years after undergoing a median sternotomy for mediastinal seminoma followed by 50 Gy radiotherapy. He was given two courses of chemotherapy, resulting in 90% tumor regression, after which resection of the tumor with adjacent chest wall structures was carried out. Reconstruction was performed using a methylmethacrylate prosthesis prepared preoperatively. Postoperatively, he received two additional courses of chemotherapy and has had no sign of recurrence for 45 months.
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