title: Breast adenomyoepithelioma and adenomyoepithelioma with carcinoma (malignant adenomyoepithelioma) with associated breast malignancies: A case series emphasizing histologic, radiologic, and clinical correlation.
abstract: The 2012 World Health Organization (WHO) classification of breast tumors distinguishes adenomyoepitheliomas (AMEs) as benign tumors composed of a biphasic proliferation of phenotypically variable myoepithelial cells around small epithelial lined spaces. Many AMEs have demonstrated benign behavior and are often cured with excision with negative margins, but some have exhibited malignant transformation of the myoepithelial cells, ductal epithelial cells, or both. When one of the components is histologically malignant, it is termed AME with carcinoma. Due to the rarity, the literature correlating imaging, histology, and clinical outcome is limited. A retrospective review was undertaken. A review of an institutional pathology database identified 14 cases with AME or malignant AME. Most AMEs had nonspecific imaging findings and were categorized as Bi-Rads 4. Histologic features of AME did not correlate with prior or concurrent breast malignancies or any radiographic features. Clinical follow up could be obtained for all but one case (mean follow up time = 75 months). 5 cases had no known treatment post-biopsy and 5 patients received mastectomy. No recurrences were noted. 3/13 cases of benign AME had associated breast malignancies including invasive ductal adenocarcinoma and ductal carcinoma in-situ. 1 case of malignant AME had a synchronous separate malignant phyllodes tumor. Given the unclear and unpredictable propensity for malignant transformation, conservative excision with negative margins currently seems appropriate.
authors: University of Texas Health Science Center at San Antonio, Department of Pathology, 7703 Floyd Curl Drive, MC 7750, San Antonio, TX 78229-3900, USA. Electronic address: MoritzA@uthscsa.edu.
authors: August W
authors: AW
authors: Moritz
authors: The University of Texas Health Science Center at San Antonio, Department of Radiology, 7703 Floyd Curl Drive, MC 7800, San Antonio, TX 78229-3900, USA.
authors: James F
authors: JF
authors: Wiedenhoefer
authors: University of Texas Health Science Center at San Antonio, Department of Pathology, 7703 Floyd Curl Drive, MC 7750, San Antonio, TX 78229-3900, USA.
authors: Amanda P
authors: AP
authors: Profit
authors: University of Texas Health Science Center at San Antonio, Department of Pathology, 7703 Floyd Curl Drive, MC 7750, San Antonio, TX 78229-3900, USA.
authors: Jaishree
authors: J
authors: Jagirdar
mesh_terms: D055331:Adenomyoepithelioma / Q000000981:diagnostic imaging / Q000473:pathology*; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001943:Breast Neoplasms / Q000000981:diagnostic imaging / Q000473:pathology*; D002277:Carcinoma / Q000000981:diagnostic imaging / Q000473:pathology*; D005260:Female; D006801:Humans; D008875:Middle Aged; D011859:Radiography; D012189:Retrospective Studies
keywords: AME; Adenomyoepithelioma; Adenomyoepithelioma with carcinoma; Malignant adenomyoepithelioma; Malignant transformation of adenomyoepithelioma; Radiology of adenomyoepithelioma