What would be the main differentials for this lytic bone lesion?
There is a lytic lesion in proximal metaphysis in a middle age patient. There is a wide zone of transition, destruction of cortex posteriorly with an aggressive periosteal reaction. The main differentials would be metastasis, telangiectatic osteosarcoma and giant cell tumor.
An ovoid poorly defined expansile lytic lesion is seen involving the central medullary cavity of proximal shaft of ulna. There is wide zone of transition with no clear demarcation/sclerosis. No matrix calcification is seen. There is cortical breach with interrupted periosteal reaction posteriorly. Mild overlying soft tissue swelling is present. There is no pathological fracture.