Multimodal imaging features of primary breast epithelial-myoepithelial carcinoma: a case report and literature review.

Breast epithelial-myoepithelial carcinoma (EMC) is a rare biphasic malignant tumor composed of both epithelial and myoepithelial components, accounting for less than 0.5% of all breast tumors. Owing to its extremely low incidence, the imaging characteristics of EMC have not been fully described, particularly with regard to emerging ultrasound techniques, such as shear-wave elastography (SWE) and contrast-enhanced ultrasound (CEUS). Herein, we report the case of a 70-year-old woman with breast EMC. The multimodal imaging findings, including digital mammography, computed tomography (CT), magnetic resonance imaging (MRI), conventional ultrasound (grayscale and color Doppler), SWE, and CEUS, are systematically presented and analyzed in correlation with the pathological findings. This report aims to improve clinical understanding of the imaging features of EMC.