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Lung metastases. Lung metastasis is cancer that started in another part of the body and spread to the lungs. Itâs sometimes called secondary lung cancer or metastatic lung tumours. Lung metastasis is not the same as cancer that starts in the lung (called primary lung cancer). Some kinds of cancer are more likely to spread to the lung than others.
Bone is the third most common location for metastasis, after the lung and liver. While any type of cancer is capable of forming metastatic tumors within bone, the microenvironment of the marrow tends to favor particular types of cancer, including prostate, breast, and lung cancers. Particularly in prostate cancer, bone metastases tend to be the only site of metastasis. The most common sites of bone metastases are the spine, pelvis, ribs, skull, and proximal femur.