A system of practical medicine. By American authors. Vol. 4

by Unknown

As pathological rarities only, and having but little clinical interest, may be mentioned, as occurring in the kidneys, fibroma, lipoma, myxoma, anginoma, and adenoma. Malignant growths originating in or involving the kidneys, sarcoma or carcinoma, are, however, more frequent and more important.

Sarcoma, primitive or secondary, of the kidney is a somewhat rare occurrence, but most frequent in children. The whole kidney may be transformed into a mass occupying its place and somewhat resembling it in form, but many times exceeding it in bulk and weight. Such a tumor may largely distend the abdominal cavity and compress its contents. Upon section we often find a substance varying greatly in consistence, from almost fibrous hardness to cavities filled with grumous material broken down by fatty degeneration and often colored by hemorrhage. In the interior may be found remains of the pyramids and cortical substance occupying their usual relative positions, but as it were distended, these portions being surrounded by a much thicker layer of purely abnormal neoplasm, probably connected with the capsule and its surrounding fat. In other cases all traces of normal form and structure may have disappeared. The microscopic structure of such a growth presents no peculiarity except so far as the arrangement of cells in the normal gland may be followed to a certain extent in the less-altered portions of the tumor. Besides this total destruction of the kidney, it is not uncommon to find nodules involving a part of one or both the organs, and more or less distinctly marked off from the healthy portion.

The origin of sarcomata involving the kidneys may be the subperitoneal cellular tissue or the neighboring organs. As a primary disease sarcoma of the kidneys is very rare.

True cancer or carcinoma of the kidney is not a common disease, and is said to have been found 12 times in 447 cases of cancer of various organs. It may be primary or secondary, and a description of the gross appearances would be essentially the same as that of the sarcoma. The tumor does not, however, usually attain so large a size, and the amount of degeneration of neighboring organs and of ulceration is greater. Calculi are often found in cancerous kidneys.

The SYMPTOMS produced by either sarcoma or carcinoma may be none at all for a time. Dull pains in the loins or referred to the hypochondrium—which, however, from their indefiniteness can have but little diagnostic importance—are among the early phenomena. Pains like nephritic colic may appear. The urine usually shows little of importance. There may be sympathetic disturbance of micturition, but unless hemorrhage occurs there is not likely to be anything in the urine discoverable by the microscope to fix the nature of the trouble. Fragments of cancer-structure in the very rare cases in which they are said to have been found would of course be conclusive, but evidence based on the alleged discovery of cancer-cells in the urine must be received with the utmost caution, recollecting the great variety of shapes and sizes assumed by the epithelium of the urinary passages. Hæmaturia is a symptom occurring in only a portion of the cases, its appearance in a given case evidently depending on the way in which the tumor invades the kidney and increases in size. If growing in such a way as to compress the ureter at an early stage before any erosion of the mucous membrane has taken place, blood, even if set free in the pelvis, cannot reach the bladder. If hæmaturia is present before any tumor can be felt, it has only a subordinate value, but if occurring after the discovery of such a tumor, the combination is of the highest significance. At a later period all the symptoms of compression of other abdominal viscera arise—anorexia, vomiting, jaundice, oedema, ascites, emaciation, and death.

When a tumor has become evident, it is to be diagnosticated from cystic disease and from hydro-nephrosis, with which it agrees in position and possibly in form. From the former of these its hardness and rapid growth, the invasion of other organs, and the cachexia will serve to distinguish it. Hæmaturia is not present in cystic disease. From hydro-nephrosis or pyo-nephrosis the diagnosis has already been stated. On the right side it might not in every case be easy to distinguish a morbid growth of the kidney from one affecting the liver, and a similar difficulty might arise on the other side with the spleen. The diagnosis is to be made by a careful location of the tumor by palpation and percussion and the absence of symptoms likely to occur in connection with affections of the organs named. In children psoas abscess and degeneration of the lumbar lymphatic glands should also be considered.

A sarcoma of the kidney has been mistaken and punctured for an empyema. A sarcoma behind the kidney, pushing it forward, is very difficult to distinguish from a similar growth affecting the organ itself, especially as it is likely to give rise to signs of renal irritation discoverable by the microscope. A slight pyelitis, distinguished by pus and the absence of any cellular elements to indicate an origin at a lower point, has been observed in such a case.

The results of exploratory puncture have been before alluded to. If a piece can be brought away large enough to be examined microscopically, it may settle the diagnosis, not only as to a malignant growth, but also as to its kind.

The distinction between carcinoma and sarcoma cannot always be made during life, nor indeed, without a microscopical examination, after death. It is of importance chiefly with reference to prognosis after operation for removal of the organ. A more rapid growth, a greater tendency to invade other organs, and a more marked cachexia would speak in favor of carcinoma, while a tumor gradually attaining a very large size, and not spreading beyond the kidney and its immediate envelopes, is more likely to be a sarcoma.

There is no TREATMENT known to be of value in cancer or sarcoma of the kidney, except so far as it may diminish pain or regulate the secretions. Surgically, removal of the diseased organ is the only expedient to be thought of. Although nephrectomy has been shown to be a perfectly practicable operation, and one that is usually well borne when the other kidney is sound, it has not proved very successful with malignant growths, even as a temporary expedient. This is partly at least to be accounted for by the difficulties lying in the way of diagnosis in the earlier stages, and the reluctance with which so serious an operation would naturally be resorted to until hopes based either on the uncertainties of diagnosis or mistaken reliance on medical treatment have been given up. Cases, however, have been reported where patients have recovered from the operation, and the disease has not returned for some months. When an operation has been resorted to, the tumor has usually become too large to be extracted through the loin, and laparotomy has been the course pursued. According to Billroth,²² out of 33 operations for tumors of the kidney, 13 have been cured.