occult non-small cell lung cancer

Definition of occult stage non-small cell lung cancer
National Cancer Institute

occult stage non-small cell lung cancer

(uh-KULT ... sel lung KAN-ser)
Cancer cannot be seen by imaging or bronchoscopy. Cancer cells are found in sputum or bronchial washings (a sample of cells taken from inside the airways that lead to the lungs). Cancer may have spread to other parts of the body.

Source: NCI Dictionary of Cancer Terms