A system of surgery . ex-ploration. (See also page 451.) Chondroma of bone.—Some of the cartilaginous outgrowthsare mere overgrowths of normal cartilage, and are called ecchon-droses (page 454). These are especially common in the costal cartilageof young women, and require no treatment. They are also found onthe laryngeal cartilages, and may give rise to dangerous symptomswhen they project on the inner surface of the larynx. Alongthe margins of the articular cartilages they are seen as smallrounded nodules, or lip growths, in the osteo-arthritis of mid-life. At the base of the triangular carti
A system of surgery . ex-ploration. (See also page 451.) Chondroma of bone.—Some of the cartilaginous outgrowthsare mere overgrowths of normal cartilage, and are called ecchon-droses (page 454). These are especially common in the costal cartilageof young women, and require no treatment. They are also found onthe laryngeal cartilages, and may give rise to dangerous symptomswhen they project on the inner surface of the larynx. Alongthe margins of the articular cartilages they are seen as smallrounded nodules, or lip growths, in the osteo-arthritis of mid-life. At the base of the triangular cartilage of the nose they haveof late received more attention than they deserve, for unlessthey produce obstruction they can do no possible harm. The true chondroma of bone arises in the medullary cavity, closeto the epiphysial end of a long bone, or between the walls and theperiosteum. It is an innocent tumour, and does not return aftercomplete removal. (See page 453.) With our present knowledge of TUMOURS OF BONE. 911. 351. — Chondroma of MetacarpalBone, arising from the MedullaryCanal, and covered with a thin shellof bone continuous with that of theshaft. (St. Thomass HospitalMuseum, No. 5S6.) histology we may safely assert that if it does return after completeremoval, it is almost certainly a chondrifying sarcoma. It is, as a rule,mainly composed of hyaline cartilage, but may have a varying amountof fibrous tissue in its matrix, or maybe mixed with other embryonic tis-sues. In the latter case it is pro-bably a chondrifying sarcoma. Calci-fication or ossification may take place,and the tumour be converted into acancellous osteoma, which is, as beforedescribed, covered with a cartilaginouscap. Fatty or myxomatous changemay also ensue, especially in thelarger growths, when the tumour iscalled a chondro-myxoma, in whichdistinct cystic cavities are oftenfound. Situation.—In the hands andfeet they are frequently multiple,arising in the medullary tissue ofthe phalanges and metac
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