A system of surgery . exostoses, are not infrequent inconnection with the nasal process of the maxilla. The affection issometimes bilateral (Fig. 364) and its cause is obscure. Smallirregular nsseous prominences often occur along the alveolar bordersof the maxilla and mandible. (See page 907.) Sarcomata.—These occur at any age, even in infants a fewmonths old. They usually spring from the periosteum or muco-periosteum, and are equally common in both jaws. They belongto the round and spindle-celled species; and, as a rule, grow withgreat rapidity, recur quickly after removal, and attain to grea
A system of surgery . exostoses, are not infrequent inconnection with the nasal process of the maxilla. The affection issometimes bilateral (Fig. 364) and its cause is obscure. Smallirregular nsseous prominences often occur along the alveolar bordersof the maxilla and mandible. (See page 907.) Sarcomata.—These occur at any age, even in infants a fewmonths old. They usually spring from the periosteum or muco-periosteum, and are equally common in both jaws. They belongto the round and spindle-celled species; and, as a rule, grow withgreat rapidity, recur quickly after removal, and attain to greatproportions (Fig. 365). The spindle-celled species, as is usual with these tumours inother situations, often contain tracts of hyaline cartilage; hencemany tumours, erroneously described by previous surgical writersas enchondromata of the jaws, belong to this species of sarcomata. Sarcomata springing from the gums usually project into thespace between the cheek and the teeth; when large, they produce SARCOMATA. 933. Fig. 364.—Bilateral Exostoses of the Nasal Processof the Maxilla. (After Hutchinson.) great displacement of the teeth and marked alterations in the con-formation of the alveolar borders of the jaws. When very large they will protrude beyond thelips. These tumours wereformerly called malignantepulides. (See also page 914.)Periosteal sarcomata of thejaws are rare before the ageof fifteen, but they are occa-sionally found in very youngchildren. (See also page 914.)Myeloid sarcomata occurin the maxilla, and, as a rule,arise in connection with thenasal or alveolar processes, andoccasionally in the the mandible they springfrom the body of the bone, andexpand its inner and outerplates. To judge from current de-scriptions, it would be ima-gined that myeloid sarcomataare fairly frequent in thealveolar borders of the jaws; this error is due to the circumstancethat sufficient attention has not been devoted to sarcomata arisingin connection with thedevelopin
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