Scrophula may be mistaken for cancer, when it appears in one of the secretory glands, such as the breasts; at least as long as it remains without ulceration. But the tumor generally enlarges more rapidly than cancerous tumors, at least such as are not very painful. It is pretty soft and doughy, the pain is inconsiderable, and we may generally perceive the marks of a scrophulous habit. When ulceration takes place, the opening is, for some time, sinous, and the matter discharged is curdy, and without fœtor. When the ulceration extends along the skin, it has not the fungous appearance of cancer, but the aspect of a scrophulous sore, and the gland below appears sloughy. The pain is not very considerable, and is not the burning kind.

Scrophulous inflammation may also attack the uterus, bladder, and any of the internal organs. The uterus and bladder become thickened, and contain abscesses in different parts, which point on the surface of these viscera. They are filled with a thick white cheesy-looking matter; and when they burst, they produce ulcers, with a foul surface, and having the margins notched, and lying for a considerable way over the disk of the sore.

The distinction betwixt cancer and the venereal ulcer is so very striking, that it is scarcely possible for these diseases to be mistaken for each other, if the discriminating marks of each be attended to. The cancerous sore is always dark coloured; the surface fiery, yet of a fungous nature; the discharge foul, and of an intolerable smell; and the bottom and surrounding parts are hard and painful. If there be not an open running sore, the part is covered with a dry elevated scab, of a dark colour; the skin around this is livid, and the neighbouring parts indurated. The base of the venereal sore is much softer, the discharge is of a different nature, and its aspect so peculiarly unlike the cancerous sore, that it is impossible to confound them[112].

There is another disease, which is very apt to be confounded with cancer, and which, at one period, resembles it very much. It begins with a small tumor, like a phlegmon, of a dull colour, and without much pain. This soon assumes a soft elastic feel, and bursts at the top; a bloody matter oozes out, the lips of the orifice become tumid, and the integuments ulcerate. The whole has a convex surface, the ulcerated part being most prominent; and the sloping margins are red and painful: The ulcer itself is foul, of a dark fungous appearance, and covered with thick offensive matter, with sloughs in different parts; the margins are hard, and lie, in a serrated manner, over part of the sore: The pain is smarting. This sometimes spreads to a considerable extent, and cuts off the patient. At other times, by the use of mild dressings, good diet, and opium internally, the fungous surface sloughs off by degrees, and shows a smooth red bottom, somewhat striated, and of a glossy appearance, which contracts, and scabs over, like the pseudo-cancer. The fungus, in this ulcer, never rises high; it is generally slightly convex, being most prominent at the centre, and has never the retorted trumpet-like appearance of some cancers.

Phagedena has sometimes, particularly on the yard, been confounded with the cancerous sore. It has indeed the brown fiery colour, and smarting pain, possessed by the cancerous ulcer; but it wants the fungous appearance, which the cancer very soon assumes. It spreads with greater rapidity, and is not surrounded by the same hardness. It begins likewise more suddenly, and without any previous hard tumor. We frequently hear of venereal buboes becoming cancerous; but this seldom, if ever, happens; and phagedena has, in this case, been confounded with cancer; for that spreading fiery honey-comb-like ulcer, which venereal buboes sometimes turn into, is evidently of the phagedenic nature.

It was from allowing too great latitude to the description or definition of cancer, as well as from the numerous divisions admitted by the older writers, such as mild, raging, and the like, that many diseases have come to be considered as cancerous, which are in their nature perhaps radically different from it.

The mild cancer was said to begin slowly, with little pain, to continue long indolent, and to ulcerate slowly: The ulcer was not very painful, and frequently healed with a scab, or remained long stationary. This evidently was not a cancerous disease, but the one which I have described above. On cutting into this tumor, after extirpation, we find it to be of a firm texture, the interstices filled with a kind oily matter, and no cavities with thickened sides in its substance.

The malignant, or true cancer, begins with a hard schirrous tumor, with frequent lancinating pain; the skin soon adheres to the gland, and becomes slightly puckered, and of a livid or leaden colour; the veins are more or less varicose, although the tumor be not large; and the nipple, when the disease is in the breast, is generally drawn inward. The integuments next become red, and a small opening forms, through which is discharged a bloody serous-looking matter, generally in very considerable quantities. The ulcer which succeeds this is, at first, superficial, affecting only that part of the integuments which covered the pointing of the glandular cyst or abscess. It is dark coloured and fiery, like phagedena; but the edges are hard and ragged, and overlap irregularly, in different spots, small parts of the surface of the sore. In the course, however, of a few days, sometimes in a few hours, a fungus protrudes, and increases more or less rapidly, at the same time that the sore spreads laterally. This fungus is very irregular, of a dark colour, and covered with sloughy-looking pellicles. It generally sprouts out most toward the circumference, so that the sore has often the appearance of the mouth of a trumpet; or if the cavity in the middle be less, the fungus being less turned out, it resembles a cauliflower. This fungus uniformly projects over the margins, which are hard and red. The matter discharged is thin, bloody, and exceedingly fœtid. On examining these glands, we find them, in the commencement, to be hard, like a substance intermediate betwixt gland and cartilage, and of an indistinct granulated structure. Soon afterwards, we perceive small abscesses or cavities in different parts, which are filled with a serous fluid, and the sides of which are hard and firm, like gristle. These enlarge gradually, and new ones form; so that were we to cut the gland, we should find it containing a great number of these cavities[113]. Those which are nearest the surface of the gland, generally enlarge most; and sometimes only one gains any considerable size. Before this bursts, its sides become more opake, and more blended with the rest of the gland, (which, where it surrounds the abscess, becomes softer, rather more vascular, and more porous or spongy than in other parts, and than it formerly was), unless it distend beyond the substance of the gland, pushing the skin outward. In this case, when it bursts, a great quantity of lymphatic matter is discharged, and the part collapses, and then exhibits the usual appearances of the cancerous ulceration: But, more frequently, we find the abscess remain altogether in the gland, and only distend the skin a little at the apex, where it points. When the abscess bursts, more or less fluid is discharged, and immediately the inner surface begins, like the orifice, to ulcerate. A fungus is produced from the sides of the abscess, which fills up the cavity, and then protrudes from the orifice. We, therefore, find, that when the cancerous abscess bursts, the orifice at first assumes the appearance of a cancer which begins in the cutis[114]; but very soon a fungus protrudes, and the ulcer gradually becomes more convex, or more like a cauliflower.

These abscesses, with thick sides, are characteristic of cancer, and are never found wanting in a cancerous gland. When they are not present, we may be certain, that the tumor is a different kind of schirrus. But although these be always found in the glands, and form in them a certain mark of cancer, yet they are not necessary to the existence of that disease; for the cancerous ulcer, like common ulcers, may begin without previous abscess, as we observe in the cancer of the skin, which, in nine cases out of ten, begins with excrescences like warts.