. Roentgen interpretation; a manual for students and practitioners . h the presence of single or multiple areas of increased densityin the lung fields near the bronchi, which may show considerablechange in plates taken before and after evacuation. Cavities canoften be demonstrated. In the early stages the picture is muchless characteristic and depends upon the demonstration of smallring-like shadows of dilated bronchi which, however, are usuallyobscured by the infiltrated lung about them. Foreign Bodies.—Foreign bodies most commonly lodge in the rightbronchus and may be recognized if of suffic
. Roentgen interpretation; a manual for students and practitioners . h the presence of single or multiple areas of increased densityin the lung fields near the bronchi, which may show considerablechange in plates taken before and after evacuation. Cavities canoften be demonstrated. In the early stages the picture is muchless characteristic and depends upon the demonstration of smallring-like shadows of dilated bronchi which, however, are usuallyobscured by the infiltrated lung about them. Foreign Bodies.—Foreign bodies most commonly lodge in the rightbronchus and may be recognized if of sufficient density to cast ashadow. Their presence may be the cause of an area of increaseddensity due to a localized pneumonia about them, to abscess forma-tion or to collapse of one or more lobes as a result of broncho-stenosis. Examination for foreign bodies should include obserNa- LUNG FIELDS 143 tion of the entire respiratory tract from different angles, a lateralview of the chest is often very helpful, any inspection of the larynxand the neck should be 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
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