Osteosarcoma is a cancer affecting bones. Bones in the limbs or the spine and skull can be affected, and where the limbs are involved the cancer often leads to weakening of the bone which may result in it becoming fractured (broken), with severe pain and lameness. Even without a fracture developing, most cases of osteosarcoma will produce progressive pain and lameness.

Osteosarcomas can spread (metastasise) to local lymph nodes and to the lungs, but this does not necessarily occur, and because of this, surgery (where possible) may be curative in these cases. Radiation and drug therapy may also be of value in some cases.

 
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