CLINICAL DIAGNOSIS OF PULMONARY AND BRONCHIAL GLAND TUBERCULOSIS

It is well known that among adults evidence of previous tuberculous infection is almost universal, and that in a large proportion of such individuals the original infection occurred during the period of childhood. In most instances, however, the changes produced in the body by such infections are so insignificant as to escape detection at the time of their occurrence. Such early infections are most often found in the lungs, although occasionally they may occur in the gastro-intestinal tract or elsewhere in the body. We are, however, at present concerned only with the respiratory form of the disease, and after the initial focus is established in the lung, should there be progression of the lesion, we next find involvement of the tracheobronchial group of glands which drain this area. Finally, by extension from the primary lung focus or from the lymphatic glands at the root of the lung, further involvement of