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Breast biopsy or excision

No change in size, 19:05, 7 January 2021
m
| Other benign mammary dysplasias and neoplasms || 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> || [[File:Histopathology of flat epithelial atypia and columnar cell change.jpg|180px]]
|-
| Breast cancer (in situ or invasive) || 10% || See next section. ||

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