Cancer cells are found in sputum (mucus coughed up from the lungs), but no tumor can be found in the lung by imaging or bronchoscopy, or the primary tumor is too small to be assessed.
OCCULT STAGE NON-SMALL CELL LUNG CANCER
Meaning of OCCULT STAGE NON-SMALL CELL LUNG CANCER in English
NCI English Dictionary of Cancer Terms. Английский словарь раковых терминов NCI(Национальный институт злокачественных новообразований). 2012