After EFT has been detected, the doctor will determine how much the disease has spread. This helps the physician decide how to treat the cancer. There is no official staging system for EFT, but the following criteria guide doctors' choices.
Localized: The cancer has not spread beyond the bone in which it originated or only to nearby tissues.
Metastatic: The cancer has spread from the bone in which it originated to other parts of the body, such as the lung, other bones and bone marrow. The disease rarely spreads to the lymph nodes (small bean-shaped organs that produce and store infection-fighting cells) or the brain and spinal cord.
Recurrent: The disease has come back after treatment. It may recur where it originated or in another part of the body.
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