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SATURDAY, OCTOBER 26, 1912
THE "PRIMARY LUNG FOCUS" IN TUBERCULOSIS, ESPECIALLY IN CHILDREN
In 1876 Parrot published the results of studies on the relationship between lesions in the lungs, principally of infectious origin, and of the tracheobronchial lymphnodes. He showed that lesions of the lungs were associated always with lesions of the same nature in the regional lymph-nodes. He found this to be true of tuberculosis also; whenever there was tuberculosis of the tracheobronchial lymph-nodes he found at least one tuberculous spot in the lungs. It is true that frequently this focus in the lungs might be so small that it was not easy to find, but it was hardly ever absent. This observation, which for a long time did not receive sufficient attention, has been confirmed by Küss and others.
THE JOURNAL OF THE AMERICAN MEDICAL ASSOCIATION. JAMA. 1912;LIX(17):1544–1548. doi:10.1001/jama.1912.04270100312022