American practice of surgery : a complete system of the science and art of surgery . nce, and wefind it spreading along the tissue interstices, and along the perineural and perivas-cular lymphatics. 366 AMERICAN PRACTICE OF SURGERY. III. THE TERATOID TUMORS. In the foregoing pages Ave have hatl untler lUscussion tumors that are membersof the great family eonnnonly known as the Blastomata. It remains for us to con-siiler the second main group, tlie Teratomata. The bhistomata have V)een dealt with at considerable length, comprising as theydo the vast majority of tumors met with. The t
American practice of surgery : a complete system of the science and art of surgery . nce, and wefind it spreading along the tissue interstices, and along the perineural and perivas-cular lymphatics. 366 AMERICAN PRACTICE OF SURGERY. III. THE TERATOID TUMORS. In the foregoing pages Ave have hatl untler lUscussion tumors that are membersof the great family eonnnonly known as the Blastomata. It remains for us to con-siiler the second main group, tlie Teratomata. The bhistomata have V)een dealt with at considerable length, comprising as theydo the vast majority of tumors met with. The teratomata, being nmchrarer, are of not so much practical importance to the surgeon, though they are ofthe greatest importance in regard to the question of tumor formation, ^^e will,therefore, in this place consider them only in a sketchy way. A teratoma is a tumor the characteristic feature of which is that it is com-posed of cells or tissues that normally do not occur in the affected part, or at leastare not present at the period of botlily development at which the growth niani-. FiG. lis.—Secondary Carcinoma of the Liver. Winckel No. 3, without ocular. (From the authors collection.) fests itself. The simplest form of teratoma is represented by a single tissue or acyst {simple teratoid tumor or cyst), but as a rule more than one tissue and morethan one germ layer are represented (mixed tumor). The term teratoma isoften applied in a narrower sense to the more complex growths, while tumorsconsisting of derivatives of all three primitive cell-layers are called cmbryoidtumors or embryomata. The tissues entering into the composition of teratomataarise either from the Aniage of the affected individual {monogerminal, endogenous,or autochthonous tercdomdta), or from those of a second individual (higerminalectogenous teratomata: fatus in fatu). Occasionally, sarcomatous or carcinomatous transformation may occur inthe tissues of a teratoma, constituting a malignant teratoma. TUMORS AN
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