Benign well encapsulated tumors 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.
Lt. Breast masses.
Three circumscribed rubbery masses measure 2x1.5 cm - 7.5x5 cm showing homogenous white cut section with slit-like appearance.
Breast masses, excision biopsy: