. Roentgen interpretation; a manual for students and practitioners . Fig. -Bronchiectasis. The process is fairly well localized in the right lowerchest. The dilated and sacculated bronchi are visible. Bronchostenosis.—Bronchostenosis gives a uniform dense shadowthroughout the area supplied by the affected bronchus and themovements of the diaphragm are limited on the affected side. Itoccurs as a result of inspired foreign bodies, aneurysm, tumors orlues. Gangrene.—Gangrene casts an extensive shadow which mayoccupy one entire lung field. Its characteristic features are the 144 THE CHEST pr
. Roentgen interpretation; a manual for students and practitioners . Fig. -Bronchiectasis. The process is fairly well localized in the right lowerchest. The dilated and sacculated bronchi are visible. Bronchostenosis.—Bronchostenosis gives a uniform dense shadowthroughout the area supplied by the affected bronchus and themovements of the diaphragm are limited on the affected side. Itoccurs as a result of inspired foreign bodies, aneurysm, tumors orlues. Gangrene.—Gangrene casts an extensive shadow which mayoccupy one entire lung field. Its characteristic features are the 144 THE CHEST presence of large irregular areas of diminished density and a generalcoarse mottling of the lung. The heart and mediastinal contentsare not displaced. This appearance may be simulated by a lungwhich has recently expanded after a prolonged pneumothorax. Primary Malignancy.—Primary malignancy of the lung is is practically always unilateral. The usual growth is a carcinomawhich occurs in two t\TDes, nodular and infiltrating. The former. Fig. 119.—Malignant disease of the lungs in a child. The entire left chest, includingthe apex, is dull. The trachea, 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 unrecog
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