Despite the very considerable literature that has appeared on the subject of the so-called chronic nontuberculous pulmonary infections and their differentiation from pulmonary tuberculosis, the occurrence of a mild type of this condition in both adults and children, and the importance of its diagnosis from the slighter forms of tuberculosis, are still altogether too often overlooked. Both conditions are not uncommon, and are frequently dismissed under various indefinite diagnoses. It has seemed worth while to review the histories of a series of patients presenting this problem to learn whether any more definite criteria of differential diagnosis could be developed.
TUBERCULOUS AND NONTUBERCULOUS INFECTIONS
The low grade tuberculous infections in childhood, with characteristic hilum localization, have for years received much attention; and the subject has been lately reviewed from the roentgenographic standpoint by Honeij, 1 and more recently in the clinical report of Eberson.2 The mild tuberculous infections of adults,