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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 is involved in the vast majority of cancer-related deaths. In order to metastasize to a new site, a tumor requires a subset of conditions. Cancer cells must first break off from the primary tumor and pass through the area surrounding the lesion and into the blood vessel or lymphatic system.hese phases are loosely based on how far the cancer has spread from the original site. The spread of cancer to other types of the body is known as metastasis. When a cancer undergoes metastasis, it travels to other organs in the body.