Modern surgery, general and operative . cause pain when they are not ulcerated. They are com-monest in the skin and connective tissue of the extremities, but they arise alsofrom neuroglia, bone, medulla of bone, periosteum, the lymphatic glands, fascia,the breast, the testicle, the eyeball, the parotid, and other parts. A pigmentedmole may become sarcomatous. Hemorrhages into a sarcoma often occur,with the result of suddenly increasing the size of the mass and formation ofblood-cysts. Sarcomata are subject to partial fatty degeneration, to myomatouschanges which produce cavities filled with f^
Modern surgery, general and operative . cause pain when they are not ulcerated. They are com-monest in the skin and connective tissue of the extremities, but they arise alsofrom neuroglia, bone, medulla of bone, periosteum, the lymphatic glands, fascia,the breast, the testicle, the eyeball, the parotid, and other parts. A pigmentedmole may become sarcomatous. Hemorrhages into a sarcoma often occur,with the result of suddenly increasing the size of the mass and formation ofblood-cysts. Sarcomata are subject to partial fatty degeneration, to myomatouschanges which produce cavities filled with f^uid, to calcification, and occasionallyto necrosis of large masses. Varieties of Sarcomata.—The following species of sarcomata are recognized: I, Ronnd-celled sarcoma is a tumor composed of round or spherical cells and resembling a chronic inflammatory area. The intercellular substance is scanty, the mass is soft and vascular, and grows with great rapidity. It often softens, and may become cystic. The cells may be small or large. The. Fig. 197 -Melanotic sarcoma. Observe the pigmentation of the face. smaller the cells, the more malignant the growth. A growth composed ofsmall round cells is the most malignant form of sarcoma (Fig. 195). Lym-phosarcoma is a form of round-celled sarcoma which arises from honphaticglands, lymphoid tissues, the thymus gland, the spleen, and some other struc-tures. The structure of a lymphosarcoma bears some resemblance to the structureof a lymph-gland in the fact that it has a reticulum which looks like that oflymph-adenoid structure. Chloroma is a form of lymphosarcoma arising particu-larly from the periosteum of the bones of the cranium and face, involvinglymph-glands and usually associated with the blood picture of leukemia. Thecells resemble those of bone-marrow. In a chloroma of the mammary glandreported by Reid, the blood picture of leukemia was absent. The cells containgreenish pigment, hence the name. What is kno\\Ti as glioma of the eyeba
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