乳腺浸润性导管癌。注意性质不明的腺体向周围胶原间质浸润。在中心的右下部也有小的微钙化，能通过乳腺X射线造影术见到。大约65%到80%的乳腺癌为这种类型。 This is infiltrating ductal carcinoma of breast. Note the infiltration of ill-defined glands into the surrounding collagenous stroma. There is also a small microcalcification at the lower right of center, a finding that could be seen by mammography. About 65 to 80% of breast cancers are of this type.