The lobule, or Terminal Duct Lobular Unit (TDLU), is the basic functional unit of the breast; Consists of 10-100 acini draining into a terminal duct; Breast contains 15-18 lobes, each made of 20-40 lobules

The TDLU is the site of development of most invasive cancers, and also DCIS, LCIS, fibroadenomas, and cysts

(Smithuis 2008)

TDLU

beast diagram

Images:Adapted from Smithuis 2008

TDLU diagram

Images:Adapted from Smithuis 2008