Secondary cancers of the lung (the lung metastases) are metastasised to the lungs from primary tumours in other parts of the body. Secondary lung cancers are quite common because the entire cardiac output has to flow through the lungs. Many cancers metastasise to the lung by traveling through the vascular and the lymphatic channels. Secondary cancers of the lung usually metastasise from primary cancers of the kidney, testis, breast, cervix, colon, rectum, skin, soft tissue and the bone. Radiologically, the secondary lung cancers usually have a typical picture showing multiple discrete nodules in the periphery of the lung parenchyma, which are scattered throughout all the lobes of the lungs. Procedures used to diagnose & evaluate secondary lung cancer include X-rays, CT scan, MRI, bronchoscopy, mediastinoscopy, and biopsy.
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