A system of surgery . ,or occupying de-pressions in thebone, from whichthey are occa-sionally origin of theseloose cartilageswill be dealt within the article de-voted to Diseasesof Joints. ()Treatment.—The operative treatment of chondromata has beengreatly simplified since surgeons have appreciated the fact thatthese tumours are encapsuled. Hence when it is necessary to in-terfere with a chondroma, even in cases where several of thesetumours are present, it has become customary to incise the capsuleand enucleate the tumour: this simple method is very
A system of surgery . ,or occupying de-pressions in thebone, from whichthey are occa-sionally origin of theseloose cartilageswill be dealt within the article de-voted to Diseasesof Joints. ()Treatment.—The operative treatment of chondromata has beengreatly simplified since surgeons have appreciated the fact thatthese tumours are encapsuled. Hence when it is necessary to in-terfere with a chondroma, even in cases where several of thesetumours are present, it has become customary to incise the capsuleand enucleate the tumour: this simple method is very , cases come under observation demanding moreserious measures: for instance, in such a case as is represented inFig. 97, the hand may become so burdensome that patients haveasked to have the limb amputated, and their wish has beencomplied with. 3. OSTEOMATA (OSSEOUS TUMOURS). An osteoma may be defined as an ossifying chondroma. Thegenus contains two species: (1) Compact or ivory osteoma;(2) cancellous Fig. 101.—Osteoma of Frontal Sinus.(Museum, Royal College of Surgeons.) 08TE0MATA. 455 Osteomata, like chondromata, are commonly met with in theneighbourhood of epiphysial lines, and in the case of skull bonesat parts where large tracts of hyaline cartilage exist in the fetalskull. Every growing osteoma has a cap of hyaline cartilagewhich stands in the same relation to the growth of the tumourthat an epiphysial line bears to a bone. (See Art. XXX.) 1. Compact OSteomata.—These are structurally identicalwith the compact tissue forming the shaft of a long bone; oftenit is as dense as the petrosal. Althoughthey may occur on any bone they aremore frequent in the frontal sinus(Fig. 101), the external and internalauditory meatuses, and on the mastoidprocess than elsewhere, They are occa-sionally met with on the angle of themandible; many supposed osteomata ofthe maxillae are odontomes. Compactosteomata are usually sessile. 2. Cancellous osteomata. —These resemble
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