Reflectance confocal microscopy (RCM) can visualize ductal epithelial cells during mammary gland development, growth, and aging. Prominent features distinguishable with RCM are (A-B) rudimentary primary ductal trees (open arrowheads), (C-D) terminal end buds (closed arrowheads), (E-I, P) secondary branching (thin arrows), (J-M) tertiary branching (open arrows), (N-O) lobules (thick arrows), (Q) ductal ectasia or enlarged ducts (^). Magnification: 30×.
Tilli et al. BMC Cancer 2008 8:21 doi:10.1186/1471-2407-8-21