Extraskeletal Osteosarcoma (ESOS), a rare entity accounting for less than 2% of all soft tissue sarcomas. Known risk factors for development include: middle aged and elderly patients, a history of radiation, and a controversial link to trauma. The typical presenting symptoms, if any, are tenderness and swelling. In trauma patients, these symptoms often mask the ESOS diagnosis and are assumed to be hematoma or other traumatic diagnosis. Easy misinterpretation of what appears to be obvious traumatic injury, can lead to delays in accurate diagnosis and appropriate treatments.