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.
1 Benign tumors â Benign lung tumors such as hamartomas can show up as a nodule in the lungs on x-ray. 2  Malignant tumors â This includes lung cancer, lymphomas, and cancer that has spread to the lungs from other parts of the body, among others. lung nodule is defined as a âspotâ on the lung that is 3 cm (about 1Â½ inches) in diameter or less. If an abnormality is seen on an x-ray of the lungs that is larger than 3 cm, it is considered a âlung massâ instead of a nodule.