Malignant adenomyoepithelioma of the breast: A case report

Eisa A Lari 1, Ali A Lari 2, Talal Alsaeed 3

Affiliations

01 January 2020

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doi: 10.1016/j.ijscr.2020.05.061

Abstract

Introduction: Malignant breast adenomyoepithelioma (AME) is a rare subtype of breast cancer. AME is mostly a benign disease that uncommonly undergoes malignant transformation.

Presentation of case: Here we present a case of a young, previously healthy female who initially presented with a painless breast lump. The patient underwent wide local excision for atypical cells with squamous metaplasia by core biopsy, but final histopathology showed AME with carcinoma. Thus, a mastectomy and a sentinel lymph node biopsy was undertaken. The patient had an uneventful recovery and no recurrence after the second surgery.

Discussion and conclusion: Malignant transformation of adenomyoepithelioma is reported in a small number of cases. Benign AME may be treated with wide local excision as recurrence is rare locally. Whereas malignant AME tends to be treated with simple mastectomy with or without lymph node biopsy.

Keywords: Adenomyoepithilioma; Breast; Malignant; Mastectomy; Wide local excision.

Conflict of interest statement

Declaration of Competing Interest The authors declare no conflict of interest.

Figures

Fig. 1 Histological features of adenomyoepithelioma with carcinoma exhibiting biphasic pattern of tubules lined by luminal epithelial and outer myoepithelial layers showing nuclear pleomorphism and mitosis (H&E in A, B and C). Immunohistochemical staining for P63 (D) and Ck5/6 (E) highlight myoepithelial layers while KI 67 (F) is about 30%.

Fig. 1 Histological features of adenomyoepithelioma with carcinoma exhibiting biphasic pattern of tubules lined by luminal epithelial and outer myoepithelial layers showing nuclear pleomorphism and mitosis (H&E in A, B and C). Immunohistochemical staining for P63 (D) and Ck5/6 (E) highlight myoepithelial layers while KI 67 (F) is about 30%.

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