Practical pathology; a manual for students and practitioners . ening of the walls of the vessels between the sections ofthe convoluted tubules. bodies often show signs of rupture, small extravasations of blood arefound within the glomerular capsule, and large masses of altered bloodmay be seen in the convoluted tubules. In the straight tubules in themedulla small collections of golden-brown pigment (derived from theblood) are met with, and here and there almost inky black melanin CHRONIC VENOUS CONGESTION 375 casts occupy a few of the tubules in the papillary portion of themedulla. The epithel
Practical pathology; a manual for students and practitioners . ening of the walls of the vessels between the sections ofthe convoluted tubules. bodies often show signs of rupture, small extravasations of blood arefound within the glomerular capsule, and large masses of altered bloodmay be seen in the convoluted tubules. In the straight tubules in themedulla small collections of golden-brown pigment (derived from theblood) are met with, and here and there almost inky black melanin CHRONIC VENOUS CONGESTION 375 casts occupy a few of the tubules in the papillary portion of themedulla. The epithelium may be granular, with small globules of fatin the protoplasm of the cells, which in some cases nearly fill thetubules. \ery fretjuently there are wedge-shaped patches of fibro-cellular tissue under the capsule, the base of the wedge being near thesurface, the apex extending for some little distance into the cortex ;these patches extend along the lines of the interlobular vessels, andenclose some of the Malpighian bodies, which then become atrophied S 9 k. ..1 ^ Fig. 104. —Drawing of a section of a kidney (l>oundary layer) in a stateof chronic venous congestion. Stained with picro-carmine. (X300.) ;;.(?. Vessels distended with coloured blood Ascending limb of looj^ed tubule of Ilenle. Spiral portion and collecting Descending limb. and fibroid. The tubules involved in these masses are atrophied andsmall, and their epithelium is flattened. This is said to be the resultof an intercurrent inflammatory condition, but it is one which isfrecjuently met with in this disease. ( X 300).—The capillary tufts in the Malpighian bodies are greatlyenlarged, the vessels being distended with red blood corpuscles;between the tuft and Bowmans capsule, blood corpuscles in variousstages of disintegration may sometimes be seen. Frequently there 376 THE KIDNEY appears to be a slight increase, not only in the number of connectivetissue nuclei, but also of the f
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