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Chest, Vol 83, 801-805, Copyright © 1983 by American College of Chest Physicians

ARTICLES

Apical localization of pulmonary tuberculosis, chronic pulmonary histoplasmosis, and progressive massive fibrosis of the lung

RA Goodwin and RM Des Prez

We have reviewed the accumulated evidence for the explanation of the apical localization of pulmonary tuberculosis, chronic pulmonary histoplasmosis, and massive fibrosis of the lung due to silicosis and coal-workers pneumoconiosis. The effect of gravity on the erect human lung results in greatly diminished pulmonary artery blood flow in the apical and subapical areas. This in turn results in higher oxygen tensions but also impairment of tissue clearance mechanisms in these areas. Analysis of the accumulated evidence better supports the theory of lymph stasis and impaired clearance of antigenic substances as the major determinant of the apical localization of pulmonary tuberculosis rather than the presently favored oxygen tension theory. The impaired clearance theory also best explains the apical localization of chronic pulmonary histoplasmosis and progressive massive fibrosis of the lung.


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