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The small round-celled sarcomas are among the most malignant tumours of bone, growing with great rapidity, and at an early stage giving rise to secondary growths. The second group includes the fibro-, osteo-, and chondro-sarcomas, and combinations of these; in all of them fully formed tissues or attempts at fully formed tissues predominate over the cellular elements.
Once the skin is broken the tumour fungates through the opening. Sarcomas vary in malignancy, especially as regards rapidity of growth and capacity for dissemination. They are usually solitary in the first instance, although primary multiple growths are occasionally met with in the skin and in the bones. Many varieties of sarcoma are recognised, according to its structural peculiarities.
There are reasons, however, which may be urged against its continuance. High amputation is unnecessary in the more benign sarcomas, and in the more malignant forms is usually unavailing to prevent a fatal issue either from local recurrence or from metastases in the lungs or elsewhere.
The pure myxoma is extremely rare, and clinically resembles the lipoma. Myxomatous tissue is, however, frequently found in other connective-tissue tumours as a result of degeneration, for example, in cartilaginous tumours and in sarcomas. Myxomatous tissue is also a prominent constituent of the "innocent parotid tumour."
#Myeloma.# The myeloid tumour, which is sometimes classified with the sarcomas, contains as its chief elements large giant cells, like those normally present in the marrow. On section these tumours present a brownish-red or chocolate colour, and, being highly vascular, are liable to hæmorrhages, and therefore also to pigmentation, and to the formation of blood cysts.
Sarcomas are devoid of lymphatics, and unless originating in lymphatic structures for example, in the tonsil they rarely infect the lymph glands. Minute portions of the tumour grow into the small veins, and, becoming detached, are transported by the blood-current to distant organs, where they are arrested in the capillaries and give rise to secondary growths.
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