Due to typical fluffy ring and arc like chondroid matrix probable diagnosis of chondrosarcoma was given.

On histopathology it turned out to be "osteogenic sarcoma with secondary chondroid degeneration".

Chondroblastic osteosarcoma, although very rare, is a differential that must always be considered in relation to chondrosarcoma, particularly in a young population and in long bones as in this case.