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epithelial dysplasia. Definitions: 1. a disorder of differentiation of epithelial cells which may regress, remain stable, or progress to invasive carcinoma. The definition information for epithelial dysplasia is provided by Stedman's. You can search our medical dictionary here.
Flat epithelial atypica is a proliferation of epithelial cells in the terminal duct-lobular units (TDLU) of the breast. Sometimes this neoplasm is called â columnar cell hyperplasia â due to the architecture of the growth pattern.It tends to grow in a â flat â pattern, without any strange build-ups or unevenness, and tends to grow into â columns â; growing taller without growing wider.ometimes this neoplasm is called â columnar cell hyperplasia â due to the architecture of the growth pattern. It tends to grow in a â flat â pattern, without any strange build-ups or unevenness, and tends to grow into â columns â; growing taller without growing wider.