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Among lesions of the viscera, mention should be made of gumma of the testis, which causes the organ to become enlarged, uneven, and indurated. This has even been observed in infants a few months old.
It is most common in male adults over forty years of age, and is usually situated on the back between the shoulders. When it occurs on the face or anterior part of the neck it is especially dangerous, because of the greater risk of dissemination of the infection. A carbuncle is to be differentiated from an ulcerated gumma and from anthrax pustule.
This is true not only of the circumscribed gumma, but of the condition known as gummatous infiltration or syphilitic cirrhosis, in which the granulation tissue is diffused throughout the connective-tissue framework of such organs as the tongue or liver. Both the gummatous lesions and the fibrosis of tertiary syphilis are directly excited by the spirochætes.
Gumma can develop almost anywhere, and where it does, there is a loss of tissue that can be replaced only by a scar. In this way gummas can eat holes in bone, or leave ulcerating sores in the skin where the gumma formed and died, or take the roof out of a mouth, or weaken the wall of a blood-vessel so that it bulges and bursts.
The life-history of an untreated gumma varies with its environment. When protected from injury and irritation in the substance of an internal organ such as the liver, it may become encapsulated by fibrous tissue, and persist in this condition for an indefinite period, or it may be absorbed and leave in its place a fibrous cicatrix.
Before the stage of cold abscess is reached, the localised swelling is to be differentiated from a gumma, from chronic forms of staphylococcal osteomyelitis, from enlarged bursa or ganglion, from sub-periosteal lipoma, and from sarcoma. Most difficulty is met with in relation to periosteal sarcoma, which must be differentiated either by the X-ray appearances or by an exploratory incision.
In the interior of a long bone it may replace the rigid framework of the shaft to such an extent as to lead to pathological fracture. Tertiary Lesions of the Skin and Subcutaneous Cellular Tissue. The clinical features of a subcutaneous gumma are those of an indolent, painless, elastic swelling, varying in size from a pea to an almond or walnut.
From their ranks are recruited a whole army of those secessions from and rebellions against the body at large the tumors, from the treacherous and deadly sarcoma, or "soft cancer," to the harmless fatty tumor, as well as the tubercle, the gumma of syphilis, the interstitial fibrosis of Bright's disease.
Gummatous disease in glands is extremely rare; the affected gland rapidly enlarges to the size of a walnut, and may then persist for a long period without further change; if it breaks down, the overlying skin is destroyed and the caseated tissue of the gumma exposed.
The caseated tissue of a gumma differs from that of a tuberculous lesion in being tough and firm, of a buff colour like wash-leather, or whitish, like boiled fish. The degenerated tissue separates slowly and gradually, and in untreated cases may be visible for weeks in the floor of the ulcer. [Illustration: FIG.
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