A system of surgery . exostoses. The conditions which shouldbe classed under this name, and sharplyexcluded from osteomata, are:—1,ossification of tendons at their attachments (Fig. 102);subungual exostosis ; 3, calcified inflammatory exudations. Many macerated preparations of bones preserved as examples ofmultiple exostoses are from individuals affected with chondromata,some of which had partially ossified. Further, some of the skeletonssupposed to be examples of multiple exostoses are really instances ofthe rare disease—myositis ossificans. (Art. XXXIV., on Injuriesand Diseases op Muscles, T
A system of surgery . exostoses. The conditions which shouldbe classed under this name, and sharplyexcluded from osteomata, are:—1,ossification of tendons at their attachments (Fig. 102);subungual exostosis ; 3, calcified inflammatory exudations. Many macerated preparations of bones preserved as examples ofmultiple exostoses are from individuals affected with chondromata,some of which had partially ossified. Further, some of the skeletonssupposed to be examples of multiple exostoses are really instances ofthe rare disease—myositis ossificans. (Art. XXXIV., on Injuriesand Diseases op Muscles, Tendons, Fasciae, and Burs/e, Yol. II.) Treatment.—Osteomata, in situations where they do not involveimportant structures, rarely demand treatment. When they pressupon important nerves, obstruct the external auditory meatus, andare clearly the source of inconvenience, deformity, or distress, theyshould be removed. When growing near large joints, great caremust be exercised in removing them. Osteomata of the ivory. Eig. 102.—Exostosis of the Eemiir,produced by ossification of thetendon of the adductor magnus.(Museum, Royal College ofSurgeons.) the 456 TUMOURS. species, when sessile, sometimes require very persevering efforts onthe part of the surgeon, aided by the best surgical cutlery. Whenan osteoma grows from the roof of the orbit, it should be remem-bered that it often projects deeply into the cranial cavity. 4. Odontomata (Tooth Tumours).Odontomes are tumours composed of dental tissues in varyingproportions and different degrees of development, arising from teeth-germs, or teeth still in the process of growth. The species of this genus, determined according to the part of thetooth-germ concerned in their formation, are:—(1) Epithelial odon-tome (from the enamel organ) ; (2) follicular odontome; (3) fibrous odontome ; (4) ce-7) mentome ; (5) com- pound follicularodontome (from thetooth follicle); (6)radicular odontome(from the papilla);(7) composite odon-tome (from
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