This is an examination of the inside of the lung airways. An optical instrument with a lighted tip is passed through the trachea and the bronchi to see whether there is a growth. Cell samples (biopsies) are taken for examination.12
12. ACS. Tests for Non-Small Cell Lung Cancer. Available at: https://www.cancer.org/cancer/non-small-cell-lung-cancer/detection-diagnosis-staging/how-diagnosed.html. Accessed 2: May 2019.