An Uncommon Case Report of Accidental Benign Breast Adenomyoepithelioma

Abstract Adenomyoepithelioma is a rare tumor characterized by the biphasic proliferation of epithelial and myoepithelial cells in breast lobules and ducts. Clinical and radiological investigations are challenging; thus, the diagnosis is mostly histopathological and confirmed by immunohistochemical analysis. Most cases are benign, although a few malignant cases have been reported. Treatment remains controversial owing to the lack of high-volume data and the absence of prospective studies. In this article, we report the case of a 19-year-old female who presented with a lump in her left breast, which was diagnosed as a benign adenomyoepithelioma. The patient underwent local excision of the lump because it was small and showed no signs of malignancy on workup. We conducted a one-year follow-up and observed no relapse.We report this rare case to encourage physicians to consider this etiology as part of the differential diagnosis while evaluating breast lumps.