Invasive ductal carcinoma   
[Source: https://emedicine.medscape.com/article/1954658-overview#a4 ]
Invasive ductal carcinoma is the most commonly diagnosed breast cancer and has a tendency to metastasize via lymphatics. This lesion, which accounts for 75% of breast cancers, has no specific histologic characteristics other than invasion through the basement membrane of a breast duct, as seen in the image below.