PLATE XVII
FIG. 1
Round-cell Sarcoma. (Low power.)
FIG. 2
Spindle-cell Sarcoma. (Low power.)
When a true osteoma is once thoroughly removed there is no tendency to recurrence. Thorough removal, however, calls sometimes for serious and often mutilating operations, which may become dangerous when the growth involves the curve of a rib or a large portion of the skull. At other times amputation is rendered necessary. Special forms require special treatment.
Sarcoma.
—Formerly this name implied a fleshy tumor, and was made to cover many different conditions. Now sarcoma means a tumor composed of immature mesoblastic or embryonic tissue in which cells predominate over intercellular material. Sarcomas are sometimes encapsulated; they merge into and infiltrate the surrounding tissue and disseminate widely, and have usually these propensities and characteristics to such a degree as to constitute malignancy. For the laity sarcomas and carcinomas are together included in the comprehensive term of cancer; for the surgeon they constitute but one form of cancer. Sarcomas are classified, according to the shape of their cells and their disposition, into—