[Extraskeletal retroperitoneal osteosarcoma. A case report and review of the literature].


Extraskeletal osteosarcomas, localized in the retroperitoneal space, are very rare neoplasms (only 200 cases have been described); the case indicated is the second one observed in Literature. The extraskeletal osteosarcomas are very malignant mesenchymal neoplasms reproducing osseous and cartilaginous tissue disconnected from the skeletal system. From a… (More)


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