A system of surgery . rsal bones (Figs. 100, 351).But they are far more frequent in thehands than in the feet. A complete shell or plate of bone may be found upon the surface. Whenmultiple they do not individually grow to any great size, but causegreat inconvenience from interference with the functions of the hand or foot (page 453). When a chondromaarises from one of the largerbones, it is commonlysingle, and may thenassume enormous propor-tions (Fig. 352). Thescapula, pelvis, or the endsof one of the long bonesare the usual sites forone of these growths, butscarcely any bone in theskeleton c
A system of surgery . rsal bones (Figs. 100, 351).But they are far more frequent in thehands than in the feet. A complete shell or plate of bone may be found upon the surface. Whenmultiple they do not individually grow to any great size, but causegreat inconvenience from interference with the functions of the hand or foot (page 453). When a chondromaarises from one of the largerbones, it is commonlysingle, and may thenassume enormous propor-tions (Fig. 352). Thescapula, pelvis, or the endsof one of the long bonesare the usual sites forone of these growths, butscarcely any bone in theskeleton can be said to befree from the possible de-velopment of a chondroma.(See Fig. 100.) In thesesituations the tumour gene-rally grows from the peri-osteum, and not from themedulla; but the bone may Fig. 352.—Chondroma of Humerus which might pos- be partially absorbed bysibly have been a Chondrifying Sarcoma. (From a *t.«- » ,?, piaster cast in St. Thomass Hospital Museum.) pressure. Many 01 these /:•; && u. 912 DISEASES OF BONES. ? enormous cartilaginous tumours would at the present time beclassified as chondrifying sarcomata ; and the possibility of thisbeing the case in any large chondroma should be borne in mind bythe surgeon in charge of the patient. Age.—The multiple tumours of the hands first make their ap-pearance in children, about puberty, or in the young adult, andincrease slowly in size for some years, and then remain stationary. The large single chondroma arises much later in life, and con-tinues, as a rule, indefinitely to increase as long as the patient lives,but without any ulterior consequence except that of inconvenience. Diagnosis*—A cartilaginous tumour is globular in outline,with a slightly lobulated surface. Its consistence is dense, but elastic,and may in parts suggest the presence of fluid beneath. There isno infiltration of the surrounding tissues, the skin and musclesmoving freely over the tumour. It merely pushes aside the over-lying and adjacent
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