正常女性乳腺显微结构。左侧可见乳腺小叶，右侧可见乳导管，它们之间是胶原基质，不定量的脂肪组织分布于这些结构之间。 The normal microscopic appearance of female breast tissue is shown here. There is a larger duct to the right and lobules to the left. A collagenous stroma extends between the structures. A variable amount of adipose tissue can be admixed with these elements.