Abstract
Extra skeletal osteosarcoma is a high-grade malignant tumor of an osteoid and cartilaginous matrix arising in the soft tissue without connection to the bone. It is known clinically for its aggressive behavior, poor prognosis, frequent recurrence and its resistance to chemotherapy, calling for expert diagnosis and necessary treatment measures. To the best of our knowledge, it is extremely rare comprising of 2-5% of all osteosarcomas and less than 1% of soft tissue tumors. We report a case of a 63-year-old with an isolated lump in right supra scapular region. After imaging, surgical excision and pathological analysis, the diagnosis of extra skeletal osteosarcoma was made. This report documents the clinical and pathological features of extra skeletal osteosarcoma in this case.
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