A Rare Case of Primary Extraosseous Osteosarcoma (EOS) of the thigh: A Case Report

Le résumé fourni par la source

Background: Extraosseous osteosarcoma (EOO) is a rare mesenchymal malignancy, which produces osteoid, bone, or chondroid material and is located in the soft tissue without attachment to skeletal bones.Case presentation: A 57-year-old male patient presented with extraosseous osteosarcoma located in the left rectus femoris muscle.The external magnetic resonance imaging revealed a large, irregular non-homogeneous contrast enhanced mass (largest diameter 9.5 cm).The final pathological diagnosis yielded extraosseous osteosarcoma.After interdisciplinary tumor board discussion, the following procedure was recommended: neoadjuvant systemic therapy with subsequent resection of the tumor and postoperative continuation of systemic therapy as well as discussion of adjuvant radiotherapy.Conclusion: EOO should be treated as a soft tissue sarcoma with aggressive behavior and multimodality treatment should be actively sought to improve treatment outcome.

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