Computed tomography of parosteal osteosarcoma of the rib

The computed tomography findings in a case of radically resected parosteal osteosarcoma of the rib are reported. Computed tomography disclosed a huge ossifying mass with lobulated structure, ossifying rim, linear lucent zone between tumor and cortex, destruction of the affected rib cortex, and intramedullary involvement. These findings are specific to advanced parosteal osteosarcoma.