. Roentgen interpretation; a manual for students and practitioners . as well as the heart, is displaced to the right. consists of dense, rounded masses, sharply marked off from the lungtissue, occurring near the hilus. Ragged, irregular cavity formationin the tumor mass sometimes occurs. In the infiltrating tj^pe, thetumor arises from a bronchus and infiltrates the lung along thebronchial ramifications. The edges of the growth are apt to besmooth except along the advancing margin tow^ard the peripheryof the lung. These growths may also extend toward the root andform large masses at the hilus.
. Roentgen interpretation; a manual for students and practitioners . as well as the heart, is displaced to the right. consists of dense, rounded masses, sharply marked off from the lungtissue, occurring near the hilus. Ragged, irregular cavity formationin the tumor mass sometimes occurs. In the infiltrating tj^pe, thetumor arises from a bronchus and infiltrates the lung along thebronchial ramifications. The edges of the growth are apt to besmooth except along the advancing margin tow^ard the peripheryof the lung. These growths may also extend toward the root andform large masses at the hilus. Collapse of the lung with displace- LUNG FIELDS 145 ment of the heart to the affected side may take place. Fluid inthe pleural space occurs early. Metastatic Malignancy.—^Metastatic malignancy appears in threeforms. In the first there is progressive enlargement of the hilusshadows which is unrecognizable in the early stages and unmis-takable in the later ones when large masses have developed at thelung roots and usually an effusion at one or both bases. A second. Fig. 120.—Malignant metastasis in the lungs from carcinoma of the stomach. and perhaps more common form is that in .which the growths takethe form of multiple, thin, rounded plaques of variable size, withsharp margins which are scattered throughout the lung the third type there is a fine mottling throughout the lung fieldswhich may suggest miliary tuberculosis, but the small areas ofincreased density are a little larger, more dense, and more sharplyoutlined than those of tuberculosis. Two or more of these formsmay occur
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