Modern surgery, general and operative . Fig. 159.—Sarcoma of antrum. Fig. 160.—Sarcoma of antrum. stage, but soon loses this except in very slovv-growing varieties or in mLxed formsgrowing by central proliferation, but secondary sarcomata are often encap-suled. Sarcomata may arise at any age from birth to extreme senility, but. Fig. 161.—Small round-ceUed fungating sarcoma of neck. they 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 parasi
Modern surgery, general and operative . Fig. 159.—Sarcoma of antrum. Fig. 160.—Sarcoma of antrum. stage, but soon loses this except in very slovv-growing varieties or in mLxed formsgrowing by central proliferation, but secondary sarcomata are often encap-suled. Sarcomata may arise at any age from birth to extreme senility, but. Fig. 161.—Small round-ceUed fungating sarcoma of neck. they 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 ofmaHgnant disease is discussed on page 348). A sarcoma may be primary or 37° Tumors or Morbid Growths may arise from malignant change in an innocent connective-tissue growth(chondrosarcoma, fibrosarcoma, etc.)- A sarcoma rarely affects adjacentlymphatic glands unless it contains lymphatics, and the great majority ofsarcomata do not contain them. Occasionally sarcoma cells are carried toadjacent glands by the vein walls rather than by the lymph-stream. Sarcomaof the tonsil, sarcoma of the testicle, melanotic sarcoma, and lymphosarcomado affect the glands. The skin over the tumor may give way, a bleedingfungous mass protruding (fungus haematodes) (Figs. i6i, 162, and 163), andsuppuration may cause septic en
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