Normal breast with lobular carcinoma in situ (LCIS) in an enlarged cross-section of the lobule

Breast profile:

A Ducts

B Lobules

C Dilated section of duct to hold milk

D Nipple

E Fat

F Pectoralis major muscle

G Chest wall/rib cage

Enlargement

A Normal lobular cells

B Lobular cancer cells

C Basement membrane