A 56-year-old male undergoes resection of a mass that was suspected to be a simple lipoma. The mass was contained within his sartorius muscle and shown in Figure A. The final pathology came back as a high grade soft tissue sarcoma. The treating surgeon operated completely within the sartorius compartment and did not violate any other compartments, however the final pathology showed positive margins. Staging studies show isolated disease in his right thigh. What is the most appropriate treatment for this patient?