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| [[Atypical ductal hyperplasia]] || 7%<ref name=Statpearls-atypical>{{cite web|url=https://www.ncbi.nlm.nih.gov/books/NBK470258/|title=Atypical Breast Hyperplasia|author=David J. Myers; Andrew L. Walls.|website=StatPearls, National Center for Biotechnology Information}} Last Update: February 15, 2019.</ref> || Epithelial proliferations which are not qualitatively or quantitatively abnormal enough to be classified as ductal carcinoma in situ.<ref name=Statpearls-atypical/> || [[File:Micrograph of atypical ductal hyperplasia.jpg|180px]]
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|rowspan=3| Other benign mammary dysplasias and neoplasms ||rowspan=23| 5% || Including:
*'''Flat epithelial atypia''': variably dilated acini lined by one to several layers of epithelial cells with low-grade cytologic atypia, usually columnar.<ref name="Schnitt2003">{{cite journal|last1=Schnitt|first1=Stuart J|title=The diagnosis and management of pre-invasive breast disease: Flat epithelial atypia – classification, pathologic features and clinical significance|journal=Breast Cancer Research|volume=5|issue=5|year=2003|issn=1465-542X|doi=10.1186/bcr625}}</ref>
*'''Columnar cell change''': Terminal duct lobular unit with epithelium exhibiting tall cells with oval or elongated nuclei orientated perpendicularly to the basement membrane.<ref name="LogulloNimir2019">{{cite journal|last1=Logullo|first1=Angela Flavia|last2=Nimir|first2=Cristiane|title=Columnar cell lesions of the breast: a practical review for the pathologist|journal=Surgical and Experimental Pathology|volume=2|issue=1|year=2019|issn=2520-8454|doi=10.1186/s42047-018-0027-2}}</ref>
