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A dermoid cyst may be defined as a heterotopic tumor, containing the products of epithelial proliferation, fat, hair, teeth, cholesterin, bone, etc. They were first described by Lebert in 1852, who applied the term "dermoid" to all cysts lined by a cyst wall resembling in structure that of the external skin. These cysts are found in nearly all parts of the body, the ovaries, testicle, orbit, floor of the mouth, brain, eye, lungs, anterior mediastinum and mesentery. They occur, however, far more frequently in the ovary. In 188 cases of dermoid cysts collected by Lebert, the ovary was found to be the seat of the tumor in 129 cases, being nearly 70 per cent, of the entire number recorded.
According to Senn the wall of a dermoid cyst is composed of connective tissue, its inner surface is often smooth resembling a serous surface, but microscopic examination always reveals an epithelial
FOX JF. DERMOID CYST OF THE OVARY, WITH REPORT OF TWO CASES. JAMA. 1898;XXX(26):1508–1509. doi:10.1001/jama.1898.72440780022002e
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