Fig. 2

Gross examination and histomorphology features. Gross findings A greyish-white mass was observed in the breast tissue section, with a greyish-white medium texture and clear borders (A). Histological staining showed that the boundary of the mass was cleared (B), and small breast ducts were visible in the periphery (C, × 100). High magnification showed poor adhesion of tumor cells, a medium amount of cytoplasm, a high nucleoplasm ratio, obvious cell heterogeneity, deep nuclear staining (D, × 200), some cells with obvious nucleoli and visible nuclear fission images (2E, × 200)