Bronchoscopy is a procedure a doctor uses to look inside the lungs. This is done with a bronchoscope, a thin, flexible tube with a light and a lens or small video camera on the end. The tube is put in through your nose or mouth, down your throat, into your trachea (windpipe), and into the airways (bronchi and bronchioles) of your lungs.
Bronchoscopy can be used to look at an abnormal area seen on an imaging test (such as a chest x-ray or CT scan).
Any abnormal areas in the airways that are seen with the bronchoscope can be biopsied to find out if they are cancer.