<prompt> An 8-year-male progressive swelling upper end tibia - irregular, local temperature raised, variable consistency and ill defined margins:Giant cell tumorEwings sarcomaOsteogenic sarcomaSecondary metastasis  <response>: c Osteogenic sarcoma- The clinical presentation in question can occur both in Ewings sarcoma and osteosarcoma.- History of trivial trauma- Progressive swelling- Raised local temperature- Variable consistency- Ill defined margins.- However, swelling is around the knee joint at upper end of tibia, which favors the diagnosis of osteosarcoma metaphyseal lesion.- Ewings sarcoma usually occurs in the diaphysis of the bone middle of the shaft. 