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embryonic rest

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embryonic rest,
a portion of embryonic tissue that remains in the adult organism. Also called epithelial rest, fetal rest.


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It is assumed that it originates in the ectopic cartilaginous embryonic rests of Meckel's cartilage of the first branchial arch.
Chondroma in the bony external ear canal. (Otoscopic Clinic) by Lee, Fei-Peng / Ear, Nose and Throat Journal
[8] There are four proposed etiologic factors: (1) a carcinoma (usually squamous) with a reactive mesenchymal proliferation (pseudosarcoma), (2) a so-called collision tumor, in which carcinoma and sarcoma arise simultaneously in a specific anatomic site, (3) a malignancy arising in an embryonic rest of epithelial and mesenchymal tissues, and (4) a divergent differentiation of a carcinoma into sarcomatous components, or sarcomatoid carcinoma.
Initial report of a case of carcinosarcoma of the supraglottis by Sweeney, James P. / Ear, Nose and Throat Journal
 
 
 
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