American practice of surgery : a complete system of the science and art of surgery . ter they reach a certainsize, and of these the cystic is perhaps the commonest. It is due to the lique-faction and mucous degeneration caused by insufficient nourishment. Thehyaline, colloid, fatty, and mucous varieties of degeneration are also oftenseen, and to the tumors which show these changes the names chondro-lipoma. TUMORS ORIGINATING IN BONE. 425 chondro-myxonia, etc., are applied. Myxo-chondromata are very common,the combination of cartilage and myxomatous cells with branching proto-plasm being seen i
American practice of surgery : a complete system of the science and art of surgery . ter they reach a certainsize, and of these the cystic is perhaps the commonest. It is due to the lique-faction and mucous degeneration caused by insufficient nourishment. Thehyaline, colloid, fatty, and mucous varieties of degeneration are also oftenseen, and to the tumors which show these changes the names chondro-lipoma. TUMORS ORIGINATING IN BONE. 425 chondro-myxonia, etc., are applied. Myxo-chondromata are very common,the combination of cartilage and myxomatous cells with branching proto-plasm being seen in most of the larger growths (Fig. 190). Retrogradechanges are also common, and the myxo-chondronia may be considered theproduct of one of these changes. Virchow distinguishes between chondromamucosum on the one hand and chondroma myxomatosum or myxoma carti-laginosum on the other, the former tumor being a simple degeneration of theground substance which is composed of mucin and chondrin, whereas the lattershould be classed among the true mixed tumors. Calcification, which occurs. Fig. 190.—A Section from a Chondroma of the Sacrum. The tumor was composed mainly ofhyaline cartilage, but this particular section shows considerable myxomatous degeneration. Nearthe capsule there is some fibro-cartilage. (Original.) frequently, takes place either in the cells or in the ground substance, as doesthe progressive change of some portions of the cartilage into true bone; but thisossification is apt to be very irregular (osteo-chondroma). Strictly speaking,this term should be applied only when it is a characteristic of the tumor to formboth bone and cartilage. A chondral exostosis, a chondroma, and a chondro-sarcoma may exist in the same individual, Loeven* having reported three suchcases. In general, therefore, it may be said that in any of these tumors sectionsshould be made from several portions, as any or all of the above-mentionedvarieties may exist in the same growth. * Loeven: Deut
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