Tubular carcinoma of the breast

(Panel A) Low-power view of a tubular breast carcinoma shows that the tumor is composed of well-formed glands or tubules that invade the mammary stroma.
(Panel B) High-power view demonstrates that the tubules are composed of columnar cells with relatively uniform nuclei. Many of the cells show "snouts" of eosinophilic cytoplasm at their lumenal ends.