Occassionally: A neoplasm is a tumor when classified as malignant has potential to metastasize. Depending on surface glycoproteins developing in the primary lesion, metatastsis is predefined when tumor invades blood stream. Certain lesion only go to lung or liver or to bone. When small e-cadherons form they promote spread and one site is a metastatic bone tumor. Some neoplasms are primary bone in origin.
Answered 2/27/2017
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