Retroperitoneal Extraskeletal Osteosarcpma: CT and MR Imaging of a case report

摘要

Extraskeletal osteosarcoma is a rare soft tissue sarcoma and is in many ways distinct from skeletal osteosarcoma, including demographics, imaging feature, prognosis and management. We present a case of extraskeletal osteosarcoma arising from the retroperitoneum with dense ossification proved to be osteosarcoma by surgical resection. We describe the computed tomography (CT) and magnetic resonance (MR) imaging, and discuss the radiological differential diagnosis of a primary retroperitoneal extraskeletal osteosarcoma.