American practice of surgery : a complete system of the science and art of surgery . a. (Original.) a fracture—or they appear near the scat of a diseased hone. In this connectionmay he mentioned the ossification observed in the deltoid, in the adductors,and in the quadratus femoris; such osseous growths,however, do not come underthe heading of true exostoses. The most common sent of eburneous exostoses is the skull. They arise onthe vertex at any point; indeed, all the bones of the skull have been reported ashaving been the seats of such growths. They are either flat, sessile tumors,slightly r
American practice of surgery : a complete system of the science and art of surgery . a. (Original.) a fracture—or they appear near the scat of a diseased hone. In this connectionmay he mentioned the ossification observed in the deltoid, in the adductors,and in the quadratus femoris; such osseous growths,however, do not come underthe heading of true exostoses. The most common sent of eburneous exostoses is the skull. They arise onthe vertex at any point; indeed, all the bones of the skull have been reported ashaving been the seats of such growths. They are either flat, sessile tumors,slightly raised, or they are cone-shaped, with a broad base. Sometimes they TUMORS ORIGINATING IN BONE. 403 are even tuberous, with more or less of a pedicle. They vary in size as wellas in shape, in time attaining large dimensions, but they are of very slow of them arise from the external periosteum, but they occasionally startin the diploe (enostoses) or even from the inner layer of the dura, inside theskull. Sex and age have no influence on the growths, although they occur. Fig. 179. —Multiple Cartilaginous Exostoses of the Femur and Tibia. Four members of the family have the disease. (Massachusetts General Hospital.) more commonly in the male. Trauma has a distinct bearing on the etiologyof these growths. Symptoms.—Exostoses, when external, cause no symptoms except such asare of a mechanical nature. If they extend into the cranial cavity symptomsof brain irritation may be present. Diagnosis.—The diagnosis is usually perfectly simple. In cases m whichthere is a question of sarcoma an .r-ray examination will show the character ofthe tumor and will also be found of value in determining whether the brain 404 AMERICAN PRACTICE OF SURGERY. cavity is involved, and the dimensions of the base of the growth. It is accessary in these cases to exclude syphilis, tuberculosis, and allied conditions. The prognosis, as regards life, is good provided the growth be external, as iti
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