Anatomic Pathology Selected Abstracts
May 2020—Flat epithelial atypia is an alteration of terminal duct lobular units by a proliferation of ductal epithelium with low-grade atypia. No consensus exists regarding whether the diagnosis of flat epithelial atypia in core needle biopsy necessitates excision. The authors retrospectively identified all in-house core needle biopsies with flat epithelial atypia obtained at their institution between January 2012 and July 2018. They reviewed all core needle biopsy slides and assessed radiologic-pathologic concordance. An upgrade was defined as invasive carcinoma or ductal carcinoma in situ in the excision, or both. The excision slides of all upgraded cases were re-reviewed.