Practical pathology; a manual for students and practitioners . seen. r. Thickened and cellular interlobular septum. (/. Thickened interalveolar septum—thickening due to varicose anddistended condition of the capillaries. e. Air vesicles in which are numerous pigmented catarrhal cellsand red blood corpuscles, from which pigment is the fibro-cellular band is the infiircted area, below itan area in which chronic venous congestion or brown in-duration is marked. Harden one piece of ccdematous lung by heat (§ 73), stain (,^ 105),and mount (§§ 193 and 199). 484 THE LUNG ( X 5
Practical pathology; a manual for students and practitioners . seen. r. Thickened and cellular interlobular septum. (/. Thickened interalveolar septum—thickening due to varicose anddistended condition of the capillaries. e. Air vesicles in which are numerous pigmented catarrhal cellsand red blood corpuscles, from which pigment is the fibro-cellular band is the infiircted area, below itan area in which chronic venous congestion or brown in-duration is marked. Harden one piece of ccdematous lung by heat (§ 73), stain (,^ 105),and mount (§§ 193 and 199). 484 THE LUNG ( X 50).—The pleura is greatly thickened, especially the deeperlayer, which is also deeply pigmented. The pigment is black andgolden-brown. The interlobular septa, the perivascular and peri-bronchial tissues, are also thickened and pigmented. In the solidwedge-shaped mass the air vesicles also have their walls thickened andpigmented, but this is partially masked by the enormous number ofred blood corpuscles which have escaped. On the pleural surface r>. J ?^y Fig. 147.—Drawing from section of brown induration of the ( x 300.) Distended capillaries of interalveolar Coloured blood corpuscles lying free in the air vesicle. Epithelial cell, Epithelial or catarrhal cell, containing a large quantity ofaltered blood Pigment in lymphatics of interalveolar septum. At the point from which this was taken the pigmentation wasvery marked ; the varicosity of the vessels is here well seen. there may be slight inflammatory changes, but these are by no meansconstant. In the portions in which brown induration is well marked, thechanges are very characteristic. The walls of the air vesicles arethickened and pigmented, and have a peculiar beaded or varicoseappearance; in the beads (or loops) there is a greenish granularmaterial—coloured blood corpuscles. Within the air vesicles similarcorpuscles may be observed, and al
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