American practice of surgery : a complete system of the science and art of surgery . arcinoma, adeno-sarcoma of jaw, multilocular dentigerouscyst, cyst-adenoma of the jaw. | These tumors are usually seen somewhat later in life thanthe other forms of odontoma. Pincus,* in a collection of twenty-five cases of cyst-adenoma of the jaw, placing the age between twenty and forty. In some cases * Arch. f. klin. Chir., 1904. lxxii., 995. TUMORS ORIGINATING IN BONE. 475 they start from the enamel organ proper, but in many cases the patient presentsa full set of teeth, and in these cases the tumors proba
American practice of surgery : a complete system of the science and art of surgery . arcinoma, adeno-sarcoma of jaw, multilocular dentigerouscyst, cyst-adenoma of the jaw. | These tumors are usually seen somewhat later in life thanthe other forms of odontoma. Pincus,* in a collection of twenty-five cases of cyst-adenoma of the jaw, placing the age between twenty and forty. In some cases * Arch. f. klin. Chir., 1904. lxxii., 995. TUMORS ORIGINATING IN BONE. 475 they start from the enamel organ proper, but in many cases the patient presentsa full set of teeth, and in these cases the tumors probably originate from epi-thelial debris. The lower jaw is much more often affected than the upper, thetumor being situated in the centre of the bone and slowly distending it; and,although the growth may be situated near the alveolar border, it is more oftenlocated in the body of the jaw at some distance from the teeth. Females aresomewhat more frequently affected than males; in the collection of cases madeby Pincus the proportion was 16 females to 9 males; in that of Steensland* it. Fig. -SeetionPortion of the Wall of a Cystic Epithelial Odontoma (Adamantine Epithelioma),of the jaw; b, fibrous tissue; c, adamantine epithelium. (Original.) Was 10 females to 8 males. On section, the tumor appears in the form of a col-lection of irregularly shaped multilocular cysts, the whole being surrounded bya thin shell of bone, from the sides of which fine bony trabecular often penetratebetween the individual cysts. As a rule, however, the trabecular are cysts vary greatly in number and size, rarely being more than 2 cm. indiameter. In some cases, however, the tumors appear nearly solid, the cysticdilatation being demonstrable only with the microscope. They are filled witheither a colloid-like material or, more commonly, with a brownish or reddishfluid containing cholesterin crystals. Microscopically, the bony shell surround-ing the tumor is irregular and presents many osteob
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