. The American journal of roentgenology, radium therapy and nuclear medicine . ason, it is felt, that wevisualize the fan-shaped area on the roent-gen-rav film is because there is lack of airin the triangular area, producing naturallyan area of greater density. Varieties of Fans.—There are apparentlytwo varieties of Dunhams fans, the largeand the small, the first being most often seenin pneumoconiosis and the second in tubercu-losis. The term fan having been used mostoften in conjunction with the subject of Dunhams Fans in a Study of Granite Dust Inhalation 563 tuberculosis from a roentgen-ray
. The American journal of roentgenology, radium therapy and nuclear medicine . ason, it is felt, that wevisualize the fan-shaped area on the roent-gen-rav film is because there is lack of airin the triangular area, producing naturallyan area of greater density. Varieties of Fans.—There are apparentlytwo varieties of Dunhams fans, the largeand the small, the first being most often seenin pneumoconiosis and the second in tubercu-losis. The term fan having been used mostoften in conjunction with the subject of Dunhams Fans in a Study of Granite Dust Inhalation 563 tuberculosis from a roentgen-ray standpoint,it doubtless has been inferred that it was apathognomonic sign of tuberculosis; but own interpretation of fans asgiven by him to me is as follows: Fanswhen seen upon the ;r-ray film are character-istic of a lung lesion but not necessarilycharacteristic of tuberculosis. The fan ofpneumoconiosis is larger and lies in the mid-zone of the lung field with lung pathologyin the form of increased densities lying be-tween it and the hilus. The characteristic. Fig. 3. Divisions of linear markings. fan of tuberculosis is small in size, lies nearthe pleura in the peripheral zone of the lungand is accompanied by a definite apical le-sion. Significance of Appearance.—What thendo fans suggest to us when viewing theroentgen-ray film ? Apparently, by means ofserial films, we are able to demonstrate ingranite cutters five stages of pathology wit-nessed on the films as follows: (i) Increasein hilus width and density, giving evidence ofcontinued drainage of an irritant throughthe lymphatics from the periphery back tothe tracheobronchial lymph-nodes. (2) In-creased width and density of trunk mark-ings, giving evidence of hyperplasia, fromthe passing of the irritant through thelymphatics. (3) The appearance of lung den-sities in the situation of the lymph nodules atthe branching of the bronchi, these nodulestaking on their function the same as the cerv- ical glands take on
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