A system of surgery : theoretical and practical . rently by this term those shellsof bone which sometimes are formed by the development of a tumour (generallycartilaginous) in the centre of a shaft. Such a case was the one from which fig. 60is taken. Another kind of exostosis is that which proceeds from the ossificationof tendons, or from the occurrence in man of processes of bone natural to the loweranimals. Both of these belong rather to the class of museum curiosities than ofsubjects of practical interest. Excluding these rarer varieties, the cases of cucumscribed exostosis which sur-geons
A system of surgery : theoretical and practical . rently by this term those shellsof bone which sometimes are formed by the development of a tumour (generallycartilaginous) in the centre of a shaft. Such a case was the one from which fig. 60is taken. Another kind of exostosis is that which proceeds from the ossificationof tendons, or from the occurrence in man of processes of bone natural to the loweranimals. Both of these belong rather to the class of museum curiosities than ofsubjects of practical interest. Excluding these rarer varieties, the cases of cucumscribed exostosis which sur-geons have to treat are divided into two classes—the. cancellous, and the ivory; theformer being a reproduction of the tissue of the interior, as the latter is of thehard exterior of the bone. They will be found described in the essay on Tumours(vol. i. p. 266). Fig. 60.—Bullous Exostosis on the Phalanxof a finger; probably a shell of boneexpanded around a cartilaginous tumour.(From a preparation in St. GeorgesHospital Museum, Series ii. No. 151.). Fig. 61.—Ivory Exostosis which was tre-phined unsuccessfully, on account of itsgreat hardness. Exfoliation was after-wards produced by the long-continuedapplication of caustics — chiefly nitricacid. (From the Museum of St. GeorgesHospital, Series ii. No. 189.)
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