. The principles of surgery . to that of the encysted is slow ; but the bulk acquired maybe enormous. For the smaller of such tumours—smallnot only in themselves, but also in rela-tion to the bone from which they spring— evacuation by opening and counter-opening will suffice ; pressure being alsoapplied, so as to favour contraction andconsolidation. In the larger, it is betterat once to amputate the affected part. Osteosarcoma. By this is understood a tumour composed partly of bone, partly offleshy substance—as the name implies; the latter constituent, of asimple and non-malignan
. The principles of surgery . to that of the encysted is slow ; but the bulk acquired maybe enormous. For the smaller of such tumours—smallnot only in themselves, but also in rela-tion to the bone from which they spring— evacuation by opening and counter-opening will suffice ; pressure being alsoapplied, so as to favour contraction andconsolidation. In the larger, it is betterat once to amputate the affected part. Osteosarcoma. By this is understood a tumour composed partly of bone, partly offleshy substance—as the name implies; the latter constituent, of asimple and non-malignant kind. The formation is usually attributableto external injury, perphaps slight; and originates in the cancelloustexture of the bone. The osseous part is analogous to the fibrous inter-lacement in tumours of the soft parts. It is, as it were, the stroma inwhich the other constituent is deposited; dense and solid centrally; Fig. 148. Osteocystoma, of large size ; occupying lower end of femur. Prep, inUniversity OSTEOSARCOMA. 455
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