PRIMARY MALIGNANT DISEASE OF THE TRACHEOBRONCHIAL TREE

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Abstract
One of the interesting developments of the past decade has been the marked increase in the incidence of primary malignant disease of the tracheobronchial tree. Prior to 1925, primary malignant growths in the air passages were considered rare; at present, however, they are encountered as frequently as pulmonary abscesses. It is true that certain types of malignant growths arising primarily in other organs may metastasize to the lungs and ulcerate through the bronchial wall, producing signs and symptoms that are identical with those occasioned by primary bronchial growths;1in most instances, however, the differentiation of primary and secondary neoplasms in the lung is not difficult. Metastatic nodules in the lungs, even though they may be large and numerous, rarely produce signs or symphtoms of pulmonary disease unless they involve the pleural surfaces and cause pain or effusion into the pleural space. When secondary growths are situated in the parenchyma

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