. The principles and practice of surgery. he skin. They are seen most frequently upon the tibia, fibula and humerus, andthey can only occur in children, or atsome period preceding the complete Flg248 ossification of the epiphyseal cartilages. 2. The hard exostoses, resembling inall respects the lamellated tissue of nat-ural bone, are more often spinous inform, occurring usually at the points ofattachments of muscles, and must be re-garded in most cases as examples of Simple hypertrophy of natural Spines Exostosis from nppe^cxtremity of humerus. and processes. They are met with, also, pretty fr
. The principles and practice of surgery. he skin. They are seen most frequently upon the tibia, fibula and humerus, andthey can only occur in children, or atsome period preceding the complete Flg248 ossification of the epiphyseal cartilages. 2. The hard exostoses, resembling inall respects the lamellated tissue of nat-ural bone, are more often spinous inform, occurring usually at the points ofattachments of muscles, and must be re-garded in most cases as examples of Simple hypertrophy of natural Spines Exostosis from nppe^cxtremity of humerus. and processes. They are met with, also, pretty frequently, upon portions of the skeleton which are subjected to much pressure and attrition. 3. Eburnated, or ivory-like, exostoses, are relatively are met with most often upon the inner or outer surface of the cra-nial vault, originating sometimes, also, in the diploic structure or in thefrontal sinus, -and from thence making their way inwards or are found growing from the orbital plates, from the antrum and. 490 BONY TUMORS. Fig. 249. other portions of the superior maxillae, rarely upon the inferior max-illa, the roots of the teeth, the scapula, pelvis, and other flat frequently, however, an ivory-like exostosis proceeds from thedistal extremity of the last phalanx of the great toe, and, according toPaget, its most usual seat is upon the inner margin, directly under-neath the incurvated edge of the nail. Eburnated exostoses of the outer plate of the skull generally ceaseto grow when they have attained about half an inch in diameter. Thesame class of tumors upon the great toe are usually arrested spontane-ously at a still earlier stage of their growth, while in other situationsnamed there seems to be no fixed limit to the process of growth anddevelopment. It is proper to mention that the process of eburnation is sometimesincomplete, certain portions of the tumor still presenting a cancellatedstructure. Ivory-like exostoses ex-hibit Have
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