Fig. 4

Histological findings of surgical specimen. A Excised specimen and aspirated fluid. B Cut surface of the formalin-fixed surgical specimen. C, D Histological findings from hematoxylin–eosin-stained specimens. C a; Normal lactating mammary tissue, b; sparse area with edematous changes near the normal mammary gland, c; slightly dense area with degeneration, d; cystic structure. D Only few cells around the ducts (circled by the yellow dotted line) due to degenerative change