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The wart horn grows from a warty papilloma of the skin. Cicatrix horns are formed by the heaping up of epidermis in the scars that result from burns. If an ulcer forms at the base of a horn, it may prove the starting-point of epithelioma, and for this reason, as well as for others, horns should be removed. [Illustration: FIG.
The clinical features and treatment of the various forms of papilloma are considered with the individual tissues and organs. #Adenoma.# An adenoma is a tumour constructed on the type of, and growing in connection with, a secreting gland. In the substance of such glands as the mamma, parotid, thyreoid, and prostate, adenomas are met with as encapsulated tumours.
Papillomatous growths are also met with in the larynx, in the ducts of the breast, and in the interior of certain cystic tumours of the breast and of the ovary. Although papillomas are primarily innocent, they may become the starting-point of cancer, especially in persons past middle life and if the papilloma has been subjected to irritation and has ulcerated.
#Papilloma.# A papilloma is a tumour which projects from a cutaneous or mucous surface, and consists of a central axis of vascular fibrous tissue with a covering of epithelium resembling that of the surface from which the tumour grows.
#Papilloma.# The common wart or verruca is an outgrowth of the surface epidermis. It may be sessile or pedunculated hard or soft. The surface may be smooth, or fissured and foliated like a cauliflower, or it may be divided up into a number of spines. Warts are met with chiefly on the hands, and are often multiple, occurring in clusters or in successive crops.
In the papillomas of the skin commonly known as warts the covering consists of epidermis; in those growing from mucous surfaces it consists of the epithelium covering the mucous membrane. When the surface epithelium projects as filiform processes, the tumour is called a villous papilloma, the best-known example of which is met with in the urinary bladder.
On one occasion a steamboat captain refused to take him as a passenger. Treves exhibited him twice before the Pathological Society of London. His affection was not elephantiasis, but a complication of congenital hypertrophy of certain bones and pachydermatocele and papilloma of the skin. From his youth he suffered from a disease of the left hip-joint.
CLASSIFICATION OF TUMOURS: I. Connective-tissue tumours: Innocent: Lipoma, Xanthoma, Chondroma, Osteoma, Odontoma, Fibroma, Myxoma, Endothelioma, etc.; Malignant: Sarcoma II. Epithelial tumours: Innocent: Papilloma, Adenoma, Cystic Adenoma; Malignant: Epithelioma, Glandular Cancer, Rodent Cancer, Melanotic Cancer III. Dermoids IV. Teratoma.
An excessive and erratic growth of epithelium is the essential and distinguishing feature of these tumours. The innocent forms are the papilloma and the adenoma; the malignant, the carcinoma or cancer.
Structure of skin Blisters Callosities Corns Chilblains Boils Carbuncle Abscess Veldt sores Tuberculosis of skin: Inoculation tubercle Lupus: Varieties Sporotrichosis Elephantiasis Sebaceous cysts or wens Moles Horns New growths: Fibroma; Papilloma; Adenoma; Epithelioma; Rodent cancer; Melanotic cancer; Sarcoma AFFECTIONS OF CICATRICES Varieties of scars Keloid Tumours AFFECTIONS OF NAILS.
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