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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.
Metastasis occurs when breast cancer cells travel through the circulatory system and seed new cancer deposits called micrometastases. These tiny tumors are at first too small to detect, but in time the cells may keep on dividing in the new location. The tumors that the dividing cells form can only be detected by scans when they grow above a certain size, so a clear scan unfortunately doesnât mean that there is no cancer.