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.
Doctors may call them lesions, coin lesions or solitary. pulmonary nodules (SPN). Lung nodules are very common â at least 50% of. people have them by the time they are 50 years old. The challenge is figuring. out which nodules are or will become cancer. All lung cancer starts with a nodule but 95% of lung nodules are not cancer. Nodules that are not cancer may be the result of a bacterial or fungal infection. in the past that causes inflammation and scarring in the lungs. For the small. group of people who are screened and have lung cancer, it is usually found in.