. General surgical pathology and therapeutics, in fifty lectures : a textbook for students and physicians. endon, as a result of which the finger may remain stiff. Therehave not been enough careful observations to verify DieffenhacKsassertion, that any remnants of the chondroma that may be left ossifyand become stable; hence the removal of chondroma from boneshould be limited to few cases, and to those where the tumor is stillsmall. If the tumors have attained a considerable size, we postponeexarticulation of the fingers to a time when the tumors shall haverendered the hand entirely useless. 4
. General surgical pathology and therapeutics, in fifty lectures : a textbook for students and physicians. endon, as a result of which the finger may remain stiff. Therehave not been enough careful observations to verify DieffenhacKsassertion, that any remnants of the chondroma that may be left ossifyand become stable; hence the removal of chondroma from boneshould be limited to few cases, and to those where the tumor is stillsmall. If the tumors have attained a considerable size, we postponeexarticulation of the fingers to a time when the tumors shall haverendered the hand entirely useless. 4. OSTEOMATA—EXOSTOSES. By this term we designate abnormally-formed masses of bone,which are circumscribed, and have an independent growth, not de-pending on a chronic inflammation. Formation of bone also occursoccasionally in other tumors, especially in those forming in bone, as 598 TUMORS. we have already remarked when speaking of chondroma. But thename osteoma is usually limited to tumors consisting entirely of may mention here that not only new formations of entire teeth Fig. 123. Fig. 122. Odontoma of a back tooth,natural size. Section of an odontoma. Magnified 100 diameters. (very irregularly shaped) occur in ovarian cysts and in the antrumHighmori, but that on the teeth themselves outgrowths of true ivorymatter, ivory exostoses (odontoma of Virchow) have been observed;but these are very rare, and may be regarded merely as consist partly of spongy bone-substance, like that in themedullary cavity of bones, partly of ivory-like substance, like that inthe regular lamellae of the cortical substance of the hollow bones;hence we shall distinguish spongy exostoses and ivory exostoses. Athird form of osteomata is formed by the ossification of tendons, fas-ciae, and muscles, whose right to be classed among tumors is, how-ever, doubtful. (a.) /Spongy exostoses, with cartilaginous covering (exostosis car-tilaginas). These tumors occur almost exclusively
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