A benign well encapsulated tumor formed of proliferating breast ducts and stromal fibrocytes. The latter predominate in the lesion thus compressing ducts into slit-like structures. Submitted soft tissue showing breast tissue shows preserved normal lobular pattern with stromal fibrosis and adenosis. Cytologic features are unremarkable. No evidence of malignancy.
Mass located at the 12 o'clock position of the right breast.
Circumscribed rubbery mass 1x1 cm showing homogenous white cut section and fatty tissue measures 3.8 x 2.8 x 2 cm.
Breast mass, excision biopsy: