Gynaecology for students and practitioners . been reported in a woman of forty-nine. Generally speaking, theyform solid irregularty lobulated growths, containing more or lessnumerous cystic spaces, some of degenerative origin, others hned withepithelium. Microscopic examination reveals the presence of anextraordinary variety of embryonic tissues derived from all three layersof the blastoderm, and these occur in confused association, withoutany attempt at the formation of fully organized structures, such asthe teeth, skin, and bone which are characteristic of teratomatouscysts. The various elem
Gynaecology for students and practitioners . been reported in a woman of forty-nine. Generally speaking, theyform solid irregularty lobulated growths, containing more or lessnumerous cystic spaces, some of degenerative origin, others hned withepithelium. Microscopic examination reveals the presence of anextraordinary variety of embryonic tissues derived from all three layersof the blastoderm, and these occur in confused association, withoutany attempt at the formation of fully organized structures, such asthe teeth, skin, and bone which are characteristic of teratomatouscysts. The various elements are, for the most part, in a veryembryonic state and are very irregularly arranged. In consequence 696 GYNECOLOGY of their embryonic character the foetal constituents show a pro-nounced tendency to active prohferation, tissue-growth is veryrapid, and not infrequently it is malignant, metastases being formedin which the embryonic tissue is mostly of sarcomatous type (seeFig. 399), carcinomatous metaplasia being less frequent. On macro-. B Fig. 39D. Solid Ovarian Teratoma, x 278. Showing areas of three distinctive types of new growth. A, Sarcoma. B, Cartilage. C, Ovarian stroma. D. Embryonic gland-tubules. scopic section, soft brain-like tissue predominates, but this is oftencombined with numerous small and large cysts containing epidermalstructures. Microscopically every tissue of the human body can berepresented, the different structures being found in varying degreesof development but mostly immature. Histogenesis. The theories that ovarian teratomata might arisefrom parthenogenesis and sporogeny (asexual reproduction) are notseriously entertained by modern pathologists. Although this mode ofreproduction is seen in certain plants and certain insects, there is noevidence of its occurrence in the higher animals. A later theory,enunciated by Cohnheim, ascribed the inception of tumours generally, COMPOUND OVARIAN TUMOURS 697 to misplaced embryonic rudiments, cells or aggregat
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectgynecology, bookyear1
