The science and art of surgery : being a treatise on surgical injuries, diseases, and operations . stinct ; then only a few epi-thelium-cells can be recognised in the crowd of leucocytes ; lastly, notiiingbut leucocytes can be seen, and a little nearer the centre the intercellularsubstance becomes fluid, and the cells float free, and pus is so red areola is not found to be due to extravasation, althougli hfemor-rhages may exist scattered through such a kidney. The yellow streaksin the pyramids are found to be due to a similar condition of Sometimes cl
The science and art of surgery : being a treatise on surgical injuries, diseases, and operations . stinct ; then only a few epi-thelium-cells can be recognised in the crowd of leucocytes ; lastly, notiiingbut leucocytes can be seen, and a little nearer the centre the intercellularsubstance becomes fluid, and the cells float free, and pus is so red areola is not found to be due to extravasation, althougli hfemor-rhages may exist scattered through such a kidney. The yellow streaksin the pyramids are found to be due to a similar condition of Sometimes clots may be seen in the vessels of the 714 SECONDARY DISEASES OF THE URINARY ORGANS. pyramids. These are probahly secondary to the inflammation of theparts surronnding the vessels. As in the former A^ariety, small roundcells may be found in the tubules as well as outside them. The epithe-lium is usually much swollen, and sometimes desquamating and chokingthe tubules, but this is only in those areas in which the interstitial in-flammation is most advanced. In others it may appear almost Fig. 709.^Acute Interstitial Nephritis : Conditionof Epithelium. Fig. 710.—A. Groap of Abscesses on Surface ofKidney, b. Vertical Section of the same. This form of kidney merges into the diffuse variety, the solid yellowishspots before mentioned representing points which, had the patient livedlonger, might have softened into abscesses. It is of course frequentlyconjoined with the signs of pressure, absorption of the pyramids, anddilatation of the pelvis. It is perhaps the most frequent form met within the post mortem room. The abscesses of the kidne}^ thus arising fromacute suppurative nephritis must not be confounded with those seen asthe result of the lodgment of septic embola in pyaemia. These are usu-ally larger, are more distinctly wedge-shaped, and sometimes surroundedby a zone of haemorrhage. They are always in the cortex, and thepyramids show no signs of disease. Pyelitis is ab
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