. La revue américaine de roentgoénologie, radium thérapie et médecine nucléaire . le diaphragme, leurs ombres apparaissent plus bas dans le champ pulmonaire sur l'inspiration dia-phragmatique, en raison de la plus grande descente du diaphragme avec la thistvpe de respiration. Ce changement dans la position des ombres hilaires peut être amountto deux espaces ou plus, et être associ-ated à des moments avec des changements appréciables dans le contour et la densité. Dans la figure 2il y a une ombre annulaire adjacente à la mutation 630 des ombres pulmonaires due au type de respiration hile gauche sur la respiration diaphragmatique, mais, comme on peut le voir dans la figure 1,
2000 x 1250 px | 33,9 x 21,2 cm | 13,3 x 8,3 inches | 150dpi
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. The American journal of roentgenology, radium therapy and nuclear medicine . the diaphragm, their shadows willappear lower in the lung field on dia-phragmatic inspiration, because of thegreater descent of the diaphragm with thistvpe of breathing. This change in theposition of the hilar shadows may amountto two interspaces or more, and be associ-ated at times with appreciable changes inboth outline and density. In Figure 2there is an annular shadow adjacent to the 630 Mutation of Pulmonary Shadows Due to Type of Breathing left hilum on diaphragmatic breathing, but, as may be seen in Figure 1, this isabsent on thoracic breathing. Of particular interest to the presentdiscussion, however, is a difference in thedistribution and mutation of the pulmo-nary shadows, which may be appreciated striking, and in Figures 5 and 6, thoughdifferent, it is still quite evident. It has been suggested that the film oncostal breathing best serves for a pathologi-cal interpretation of tuberculosis. Thissupposition, however, is not supported byanv known facts. Moreover, from the fore-. Fig. 3. Costal breathing. Case 6746. Note particularlythe dense uniform shadow occupying the outer two-thirds of the second, tliird and fourth interspaces onthe right side, internally fusing with the hilumshadow. best by a comparison of the films oncostal inspiration with those on diaphrag-matic inspiration. In certain instances, shadows ordinarily termed hard, andregarded l> some observers as denotingfibrosis ami inactivity, may be convert-ed into shadows which are soft andcommonly interpreted as evidence of anactivi Thus, the prominent band- like shadow which projects from the sum-mil of the (eft hilum in Figure 1 has beenreplaced in Figure 2 In a shadow which ismore or less i - ristically soft in type. The adjacent shadows also partake of thechange, although to a lesser degree. InI lines 3 and 4 the mutation is even more Fig. 4. Abdominal breathing. Case 6746. Note theremarkable change in the location
