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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.
Cancer from other organs also may spread to the lungs. When cancer cells spread from one organ to another, they are called metastases. Lung cancers usually are grouped into two main types called small cell and non-small cell. These types of lung cancer grow differently and are treated differently.