[A curious biphasic breast lesion]. / Une curieuse lésion biphasique du sein.

Adenomyoepithelioma represents 0.5% of breast tumors in postmenauposal women. Prognosis is good when the tumor is benign. However, its malignant variant is associated with a poor prognosis with local recurrences and metastatic potential. We present the case of a malignant adenomyoepithelioma, expose the 2019 WHO classification issues and propose a classification in three categories: benign, atypical and malignant adenomyoepitheliomas (in situ and invasive).