Renal Cysts.—Cysts of the kidney are very commonly mistaken for ovarian cysts. I have made this mistake, and it was not until after breaking up adhesions and emptying the cyst that I discovered the character of the tumor. It was successfully removed. Renal cysts start from below the floating ribs and extend downward and forward, while an ovarian cyst begins from below and grows upward. The former, being generally caused by impaction of a calculus in the ureter, are usually associated with urinary disturbances. They also push the intestines before them, which give a resonant sound on percussion, while the contrary holds good with an ovarian cyst. Since the transverse colon lies between the cyst and the liver, the line of resonance caused by it will show that the cyst is not hepatic. The fluid withdrawn from a renal cyst contains urea and the other constituents of urine, but the urinous odor will be either very faint, or, as in my case, wholly absent. It may as well be stated here that when renal cysts present great difficulties in the way of their removal, they had better be treated by a large drainage-tube.
A floating kidney may be mistaken for a small ovarian tumor. But the latter has a pelvic attachment and can readily be pushed down into the basin, while the former is kept from being pushed very low downward by an upper attachment. Again, the floating kidney usually keeps its peculiar shape, and it is frequently lost by slipping from under the fingers into its natural bed in the flank.
Spina Bifida.—Strange as it may seem, this spinal cyst, when internal on account of a deficiency in the anterior parietes of the lower vertebræ, has been mistaken for an ovarian or a parovarian cyst. I am cognizant of two such errors of diagnosis made by two distinguished gynecologists. In each the sac was emptied by the aspirator, and the patient perished shortly afterward with the same kind of cerebral symptoms which follow the sudden withdrawal of the fluid from the cavity of an external spina bifida.
Phantom Tumors.—In the diagnosis of an ovarian cyst one must be on guard not to mistake for it a phantom tumor. In this imaginary kind of tumor, which hysterical women have the knack of creating, the whole belly will be uniformly distended to the size of the gravid womb at term. This is caused partly by flatus and fat, and partly by the arching forward of the spinal column, with the recti muscles drawn so tense that they cannot be indented. I have frequently had patients with this kind of abdominal enlargement sent to me from a distance, under the impression that it was due to some kind of tumor. But the diagnosis is easily made from the uniform resonance all over the belly; if, moreover, the patient's attention be engaged by conversation, the rigidity of the recti muscles disappears, the abdomen becomes flaccid, and the hand can be made to sink in so as to feel the spine. In very nervous women it may be needful to administer an anæsthetic, when all the tokens of a tumor will promptly disappear.
Obesity.—A large accumulation of fat on the abdominal wall and in the omentum has frequently given rise to the suspicion of the existence of an ovarian cyst. This condition occurs, usually, at the climacteric, and on percussion the vibratile thrill of the fat-laden wall of the abdomen conveys a very misleading impression of fluctuation. Further, to add to the difficulty, if the layer of fat be a very thick one, the abdomen, instead of being resonant on percussion, yields a dull note. But in obesity the fat is not limited to the abdomen, for the breasts, face, and limbs partake of the general enlargement. The abdominal wall hangs in folds when the sitting posture is assumed, and the umbilicus is indented and not protuberant. My own method of making the diagnosis is to grasp the abdominal wall with both hands and ascertain the amount of fat. When this amount is excluded, there will not be found room enough behind it for a tumor of any size, and the enlargement will thus be satisfactorily accounted for.
A dilated stomach, cystic tumors of the omentum, and encysted abscesses of the peritoneal cavity, and, indeed, of the abdominal wall, have been mistaken for ovarian tumors; but these are very exceptional cases. In all doubtful cases an exploratory incision should be resorted to.
SURGICAL TREATMENT OF OVARIAN CYSTS.—In the consideration of this subject it may be divided into the palliative treatment and the radical treatment.
Palliative Treatment.—Tapping either by the trocar or by the aspirator comprises the only palliative treatment of ovarian cysts; yet, as a broad rule with but few exceptions, an ovarian cyst should not be tapped. The objections to this operation are—that, slight as it may seem, it is by no means devoid of danger. Even when the smallest hollow needle of the aspirator has been used inflammation of the cyst may follow, which will compel the immediate resort to ovariotomy and very greatly compromise the success of this radical operation.28 This has repeatedly happened—once in one of my own cases, in which, however, the removal of the cyst saved my patient's life. Further, the fluid of a polycyst is usually acrid—so much so sometimes as to irritate the hands of the operator—and the escape of a few drops into the cavity of the peritoneum may set up a violent and rapidly fatal peritonitis. Then, again, a fatal hemorrhage may take place from some wounded vessel, either in the cyst-wall, or in the adherent omentum, or in the vascular pedicle which may lie spread out in front of the cyst-wall, or, indeed in the abdominal wall itself, for the vessels here are often varicose from impeded circulation. In the fourth place, adhesions are very likely to form after tapping. Fifthly, innumerable child-cysts, which were very small before the tapping, being now relieved from pressure are liable to take on rapid growth and make the tumor more solid; and the more solid the cyst the longer the incision needed for its removal. Sixthly, in polycysts not only are the dangers attending the operation enhanced, but the cyst rapidly refills, and the woman becomes exhausted by the drain on her system. At the very best, 2 per cent. of cases of tapping in polycysts are fatal, even when performed by the most skilled specialists. Seventhly, a cyst once tapped rapidly refills, and soon needs repetitions of the operation. This drain on the system quickly tells upon the woman, and she is sometimes left too weak to have the radical operation performed. The first tapping, indeed, greatly hastens on this crisis, and it should therefore be put off as long as possible. Eighthly, a cyst emptied by tapping tends to rotate on its axis, and torsion of the pedicle may result, ending in gangrene and peritonitis. Ninthly, repeated tappings tend to convert benign papillary growths into malignant. Finally, Lawson Tait29 draws attention to the fact that "repeated tappings deprive the blood of some element or elements included in the infinite variety of albuminous substances found in ovarian cysts, the deficiency of which predisposes to coagulation of blood." Hence after the removal of the cyst deaths have been "due to the formation of a firm white clot which started from the point of ligature of the pedicle, and slowly traversed the venous system until it reached the heart, death ensuing in from thirty to forty hours after the operation. The symptoms which precede death are swelling of the legs, rapid rise of the pulse, and its disappearance from the extremities some time before death, and breathlessness, ending in suffocation and slight delirium." He has met with several such cases of venous thrombosis starting from the pedicle, and they all occurred in patients who had been previously tapped. There are, however, cases in which tapping cannot be dispensed with; for instance—
1. Many women with ovarian tumors, having heard of cases of abdominal effusion or of cyst in which tapping was followed by a cure, will not submit to the radical operation until repeated tappings have proved to them the futility of the trocar.