Mixed lytic/sclerotic lesion of right posterolateral 10th rib, with extensive aggressive-appearing periostitis, as well as a multilobulated soft tissue component. Mass displaces and involves both the right 10th intercostal artery, as well as more superior right 9th intercostal artery. Mild mass effect on adjacent lung, diaphragm, and liver.
No evidence of further lesions.
Findings are most suggestive of a primary bone malignancy, especially Ewing's sarcoma. Other sarcoma such as osteosarcoma, aggressive chondrosarcoma, or rhabdomyosarcoma are less likely due to location.