Modern surgery, general and operative . his except in very slow-growing varieties or in mixedforms growing by central proliferation, but secondary sarcomata are often encap-suled. Sarcomata may arise at any age from birth to extreme senility, butthey are commonest during youth and early middle age. They are not heredi-tary. They often follow traumatism and inflammation. A number of observersmaintain that they are due to parasites (the question of the parasitic origin ofmalignant disease is discussed on page 399). A sarcoma may be primary ormay arise from malignant change in an innocent connect
Modern surgery, general and operative . his except in very slow-growing varieties or in mixedforms growing by central proliferation, but secondary sarcomata are often encap-suled. Sarcomata may arise at any age from birth to extreme senility, butthey are commonest during youth and early middle age. They are not heredi-tary. They often follow traumatism and inflammation. A number of observersmaintain that they are due to parasites (the question of the parasitic origin ofmalignant disease is discussed on page 399). A sarcoma may be primary ormay arise from malignant change in an innocent connective-tissue growth(chondrosarcoma, fibrosarcoma, etc.). A sarcoma rarely afiects adjacentlymphatic glands unless it contains lymphatics, and the great majority ofsarcomata do not contain them. Occasionally sarcoma cells are carried to ]MaliKnant Connecti\e-tissue Tumors, or Sarcomata 423 .adjacent glands by ihe vein walls rather than by the lymph-stream. Sarcomaof the tonsil, sarcoma of the testicle, melanotic sarcoma, and lymphosarcoma.
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