Infiltrating Lobular Carcinoma
Infiltrating lobular carcinoma (ILC) is characterized by a uniform population of small to medium-sized tumor cells that exhibit lack of cohesion. In a classical case of ILC, they grow in slender strands or single files (Indian file) or in a concentric fashion around ducts or lobules. The background stroma is usually densely fibrotic. A few uninvolved ducts and lobular units are seen in this image.