Adenomyoepithelioma of the breast with malignant transformation and repeated local recurrence: A case report

Figure 2 Imaging and pathology findings at first recurrence. A: Ultrasonography showed a well-defined, oval, low-isoechoic mass; B: The tumor was a cystic lesion, and the cystic wall had nodules or irregular thickening. The cysts contained mucus (× 32 magnification); C and D: Epithelium with squamous metaplasia growing into the lumenal side (C: × 100 magnification, lumen side) and (D: × 100, membrane side). Dense growth of spindle-shaped myoepithelium is found on the side of the membrane. The myoepithelium spreads underneath the existing glandular epithelium. Tumor cells show prominent nuclear atypia and high mitotic counts; E: The Ki 67 hot spot is 57.1% (× 100 magnification, Ki67).