Fig. 2From: Association between mammographic breast density and histologic features of benign breast diseaseHistology of breast tissue showing combinations of fibrosis (“no” for absent and “yes” for present) and extent of lobular involution (no involution and complete involution). a Fibrosis “yes”, involution complete. b Fibrosis “yes”, involution “no”. c Fibrosis “no”, involution complete. d Fibrosis “no”, involution “no”Back to article page