embryonic rest

embryonic rest

a portion of embryonic tissue that remains in the adult organism. Also called epithelial rest, fetal rest.
References in periodicals archive ?
While several general concepts of the etiology of the disease such as retrograde menstruation, coelomic metaplasia, lymphovascular metastasis or the embryonic rest theory have been developed, the molecular mechanisms underlying the disease are currently still incompletely understood, hampering the development of efficient targeted therapies with limited side effects.
Gartner's duct cysts from embryonic rest cells arise from remnants of the metanephric duct system.
Marsupialization rather than excision is the treatment of choice because these embryonic rest cells may extend deep into the retroperitoneum.
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.
It is assumed that it originates in the ectopic cartilaginous embryonic rests of Meckel's cartilage of the first branchial arch.