. Injuries and diseases of the jaws : the Jacksonian prize essay of the Royal College of Surgeons of England, 1867. rom itssurface. ]\lr. Fearn removed the left half of the jaw fromthe syn)physis to the articulation, and on division of theIjfne with tlie saw, a quantity of fotid pus escaped. Thetumour (fig. 83) proved to be a bony cyst formed by the DENTIGEROUS CYST OF LOWER JAW 189 expansion of the two plates of the jaw, Avhich extended forsome distance to the right of the symphysis (a very unusualoccurrence). The cavity is lined with a thick vascularmembrane, and at the bottom the canine too
. Injuries and diseases of the jaws : the Jacksonian prize essay of the Royal College of Surgeons of England, 1867. rom itssurface. ]\lr. Fearn removed the left half of the jaw fromthe syn)physis to the articulation, and on division of theIjfne with tlie saw, a quantity of fotid pus escaped. Thetumour (fig. 83) proved to be a bony cyst formed by the DENTIGEROUS CYST OF LOWER JAW 189 expansion of the two plates of the jaw, Avhich extended forsome distance to the right of the symphysis (a very unusualoccurrence). The cavity is lined with a thick vascularmembrane, and at the bottom the canine tooth will be seenprojecting from the wall. The case was evidently thereforeone of dentigerous cyst, due to the non-development of thecanine tooth, the contents of which had, from some cause,become purulent. The mental foramen, with the nerveemerging, is still visible in the preparation and drawing (). The patient made a good recovery. A very similar case is recorded by Dr. Forget, in hisessay on Les Anomalies Dentaires et leur influence sur laproduction des Maladies des Os Maxillaires, 1859, which Fig. is translated by Mr. E. T. Hulme, in the Dental Bciicv,1860. The patient was a woman aged thirty, who had atumour on the right side of the lower jaw, of tlie size of ahens egg, extending from the lateral incisor to the base ofthe coronoid process, which had been growing ten Lisfranc removed half the jaw, and the patient made agoed recovery. An examination of the tumour showed it 190 DENTIGEROUS CYSTS. to be a cyst, at the bottom of which lay the wisdom tooth,the crown projecting downwards into it, the fang being-inverted and fixed in the base of the coronoid process. Inthe illustration (fig. 85), (for which I am indebted to ), the cyst has been opened, the internal wall, h,being left; a marks the position of the tooth, and c theinferior dental canal, which has been opened to show itsnon-communication with the cyst. M. Legouest brought under the notice o
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