Interior of the cecum and lower end of ascending colon with the ileocecal valve labeled as colic valve. Endoscopic image of cecum with arrow pointing to ileocecal valve in foreground.
Lung cancer is a malignant tumour that starts in the cells of the lung. Malignant means that it can spread, or metastasize, to other parts of the body. When cancer starts in lung cells, it is called primary lung cancer. The lung is part of the respiratory system. You use your lungs when you breathe.
There are two major types of lung cancer, non-small cell lung cancer (NSCLC) and small cell lung cancer (SCLC) . Staging lung cancer is based on whether the cancer is local or has spread from the lungs to the lymph nodes or other organs.tage I: The cancer is located only in the lungs and has not spread to any lymph nodes. Stage II: The cancer is in the lung and nearby lymph nodes. Stage III: Cancer is found in the lung and in the lymph nodes in the middle of the chest, also described as locally advanced disease.