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Etiology and Occurrence. While paralysis of the femoral nerve, also known as "dropped stifle" occurs as a result of local injuries and melanotic tumors in gray horses, most cases are due to azoturia. This form of paralysis according to Hutyra and Marek is due primarily to diffuse degeneration of the muscles. Symptomatology.
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.
Melanin pigment is formed in relation to the cells and stroma of certain epithelial tumours, giving rise to melanotic cancer, one of the most malignant of all new growths. Cyst-like spaces may form in the tumour by the accumulation of the secretion of the epithelial cells, or as a result of their degeneration cystic carcinoma.
Before degenerative changes take place in the nerve substance, in such cases, pressure may completely paralyze a nerve when it is so situated. Melanotic tumors in the paraproctal tissue in some cases, because of the large size of the new-growths, cause paralysis of the sciatic nerve.
This condition occurs upon rare occasions as the result of injury such as falls which cause extreme abduction of the legs, or in pelvic fracture where the nerve is directly injured, or when melanotic tumors or other new growths compress the nerve in such manner that its function is suspended.
#Cancer.# There are several types of primary cancer of the skin, the most important being squamous epithelioma, rodent cancer, and melanotic cancer. [Illustration: FIG.
The soft parts, including the nail, should be reflected towards the dorsum in the form of a flap, the base of the exostosis divided with the chisel, and the exostosis removed. Malignant disease in relation to the nails is rare. Squamous epithelioma and melanotic cancer are the forms met with. Treatment consists in amputating the digit concerned, and in removing the associated lymph glands.
Good results are also reported from the application of carbon dioxide snow, especially when this follows upon a course of X-ray treatment. #Melanotic Cancer.# Under this head are included all new growths which contain an excess of melanin pigment. Many of these were formerly described as melanotic sarcoma. They nearly always originate in a pigmented mole which has been subjected to irritation.
In pigmented or melanotic cancers of the skin, the glands are early infected and increase rapidly, so that, when the primary growth is still of small size as, for example, on the sole of the foot the femoral glands may already constitute large pigmented tumours. [Illustration: FIG.
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.
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