General and dental pathology with special reference to etiology and pathologic anatomy; a treatise for students and practitioners . obes in both sides of the thorax are simultaneously in-volved. There are three principal stages: (a) Congestion.—The diseased area is hyperemic, dark red. lesscrepitant than normal, heavy but still floating when placed inwater, and the pleural surfaces are lustreless. Microscopically,the capillaries are congested, and the air cells contain a serous 160 GENERAL PATHOLOGY exudate with red and white blood cells, and a few desquamatedepithelial cells. As this exudate
General and dental pathology with special reference to etiology and pathologic anatomy; a treatise for students and practitioners . obes in both sides of the thorax are simultaneously in-volved. There are three principal stages: (a) Congestion.—The diseased area is hyperemic, dark red. lesscrepitant than normal, heavy but still floating when placed inwater, and the pleural surfaces are lustreless. Microscopically,the capillaries are congested, and the air cells contain a serous 160 GENERAL PATHOLOGY exudate with red and white blood cells, and a few desquamatedepithelial cells. As this exudate increases in amount, coagulationsets in (few hours to a few days) thus forming the (b) Stage of Consolidation or Hepatization.—The affected areais now solid and liver-like, deep red or brownish red in color(red hepatization), is swollen, pits on pressure and sinks whenplaced in water. On section the cut surface is red, dry, andgranular—due to plugs of fibrin projecting from the air fairly thick slice of the diseased lobe will break on the air vesicles are filled with fibrin holding in its. Fig. 59.—Acute lobar pneumonia. Early stage. This single air vesicle shows conges-tion of the capillaries in the walls, and a small amount of exudates, fibrin, leucocytes,red blood cells, and exfoliated epithelium. (Delafield and Prudden.) meshes red and white cells and desquamated epithelium. Thefibrin soon begins to contract causing a serous fluid to collectin the vesicles, the red cells disintegrate, the epithelial cells be-come fatty, and when these changes have advanced far enoughto give the affected areas a yellow or grayish color, the namegray hepatization is applied. The area is still solid but lessapt to break on bending, and the air cells contain a mass of fibrinwhich is retracted from the walls and cells, chiefly leucocytes andepithelium. (Figs. 59 and 60.) This substage (gray hepatiza-tion) does not always develop—the red hepatization pass
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectpathology, bookyear19
