A benign well encapsulated tumor formed of proliferating breast ducts and stromal fibrocytes. In areas both component are represented equally (pericanalicular pattern) however, in other areas fibroblastic proliferation dominates thus compressing ducts into slit-like structures (intracanalicular pattern). No evidence of malignancy.
Left breast lobulated mass.
Rubbery circumscribed mass measured 3x2.5x1.3 cm, totally embedded.
Left Breast Mass, Excision biopsy: