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Previous studies have elegantly demonstrated the progression of benign MGA to atypical MGA to MGA-in situ carcinoma to invasive carcinoma and therefore suggest MGA as a possible non-obligate precursor lesion to a subset of breast carcinomas. Immunohistochemically, MGA is negative for estrogen receptor (ER), progesterone receptor (PR), and HER2-neu oncoprotein expression, and carcinomas arising in the setting of MGA are often reported to be triple negative. In this article, we present a unique case of an ER+\/PR+\/HER2\u2212 invasive carcinoma associated with MGA and atypical MGA. Our case highlights the diagnostic pitfall of MGA and suggests that MGA is a heterogeneous group of lesions with potential for either luminal-type or basal-type differentiation during progression to breast carcinoma.<\/jats:p>","DOI":"10.1177\/1066896919845493","type":"journal-article","created":{"date-parts":[[2019,5,3]],"date-time":"2019-05-03T02:02:38Z","timestamp":1556848958000},"page":"781-787","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":8,"title":["Microglandular Adenosis: A Possible Non-Obligate Precursor to Breast Carcinoma With Potential to Either Luminal-Type or Basal-Type Differentiation"],"prefix":"10.1177","volume":"27","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1382-5127","authenticated-orcid":false,"given":"Alexander T.","family":"Damron","sequence":"first","affiliation":[{"name":"Hospital of the University of Pennsylvania, Philadelphia, PA, 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