. Roentgen interpretation; a manual for students and practitioners . re confirmed at autopsy. Bronchopneumonia.—Bronchopneumonia occurs more frequentlythan is generally thought. Chving to the absence of physical signs,the diagnosis may depend largely upon the roentgen examination andthe history. The appearance is that of single or multiple areas ofincreased density with hazy outlines, usually situated near the courseof the larger bronchi. The differentiation from abscess, bronchiec-tasis and malignancy depends largely upon the clinical history. LUNG FIELDS 141 Unresolved Pneumonia.—Unresolved
. Roentgen interpretation; a manual for students and practitioners . re confirmed at autopsy. Bronchopneumonia.—Bronchopneumonia occurs more frequentlythan is generally thought. Chving to the absence of physical signs,the diagnosis may depend largely upon the roentgen examination andthe history. The appearance is that of single or multiple areas ofincreased density with hazy outlines, usually situated near the courseof the larger bronchi. The differentiation from abscess, bronchiec-tasis and malignancy depends largely upon the clinical history. LUNG FIELDS 141 Unresolved Pneumonia.—Unresolved pneumonia gives a shadowresembling that of pneumonia. It must be distinguished from aninterlobar empyema, tuberculous pneumonia, or bronchial stenosislargely by the clinical and laboratory findings. It has been notedthat unresolved pneumonias may disappear after mild roentgenradiation. Bronchitis.—Bronchitis, when acute, gives no characteristic pic-ture. The chronic inflammations appear as an increase in the sizeand density of bronchial and Fig. 117.—Lung abscess. The cavity of the abscess can be seen as an area ofdiminished density in the center of the dull area in the right chest. Lung Abscess.—Lung abscess usually follows influenza or theinspiration of infected material at operation or of foreign it is a disease of symptoms rather than physical signs, sothat the roentgen examination is of the greatest help in indicatingthe site and extent of the process from its early stages. The lesionsare usually single, although they may be multiple and may occurin either lung field, showing, however, a decided preference for thebases, particularly the right. They assume the form of irregularareas of increased density which are most marked at the center, 142 THE CHEST fading out toward the periphery. Cavity formation is extremelycommon in the areas of infiltration. When filled with fluid they areindistinguishable from the general shadow about
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