Benign well encapsulated tumors formed of proliferating breast ducts and stromal fibrocytes. In the first mass both component are represented equally (pericanalicular pattern) however, in the second mass, there are areas showing that fibroblastic proliferation dominates thus compressing ducts into slit-like structures (intracanalicular pattern). No evidence of malignancy.
Rt breast masses.
Two rubbery masses measured 2.5x1.7x1.5 cm and 1x0.8x0.6 cm, totally embedded.
Right breast masses, excision biopsy: