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anal transitional zone


Definition: region of anal canal in which the epithelium changes from the simple columnar epithelium of a mucosa to the stratified squamous epithelium of the anoderm (skin); this region is susceptible to a variety of carcinomas.

Synonym(s): zona transitionalis analisTA

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© Copyright 2018 Wolters Kluwer. All Rights Reserved. Review Date: Sep 19, 2016.