. Oral pathology and practice. A text-book for the use of students in dental colleges and a hand-book for dental practitioners. d very easily, and have in such casessometimes been known as Fungous Hematodes. They are com-paratively frequent in the salivary glands, in the jaws and othertissues of the mouth, sometimes penetrating to the antrum. Theyare quite common in some of the lower animals, especially thehorse. An Osteo-sarcoma is one in which the bone tissue is in-volved. It may be Central, arising in the interior and distendingthe bony walls; Infiltrating, when the whole bony mass is perme
. Oral pathology and practice. A text-book for the use of students in dental colleges and a hand-book for dental practitioners. d very easily, and have in such casessometimes been known as Fungous Hematodes. They are com-paratively frequent in the salivary glands, in the jaws and othertissues of the mouth, sometimes penetrating to the antrum. Theyare quite common in some of the lower animals, especially thehorse. An Osteo-sarcoma is one in which the bone tissue is in-volved. It may be Central, arising in the interior and distendingthe bony walls; Infiltrating, when the whole bony mass is perme- i86 ORAL PATHOLOGY AND PRACTICE. ated and softened, or Periosteal, when it has its origin in theperiosteum. (See Fig. 50.) Carcinoma is of epiblastic origin, and is connected with someform of gland tissue. It is rare in young persons, and it commonlyinvolves the lymphatics at an early period of its development. Itis usually rapid in its growth, and it may cause a very great degreeof pain. It is very apt to attack the breast in women, but its seatmay be in the sebaceous glands, the salivary glands, the prostate, Fig. Osteo-Sarcoma of the Lower ]i (From a specimen in the Buffalo College Museum.) liver, kidney, testicles, stomach, intestines, especially the rectum, orwherever glandular tissue exists. Hence its location will be animportant guide in its diagnosis. Epithelioma, as its name indicates,is a degeneration of an epithelialsurface, usually of the skin, and consists of masses of epithelial cellssurrounded and separated by bands of connective tissue. It belongsto the malignant growths, though it does not necessarily assumetheir form. It is most apt to attack those beyond middle life, andis much more common in men than in women. It sometimes TUMORS AND NEOPLASMS. 187 arises upon the lip, from the long-continued irritation of a pipe. Itis also not infrequently caused upon the tongue, or in the oral tis-sues, by the pressure of rough, sharp edges in carious teeth, whichac
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