Figure 4. Representative blue PSLCs obtained after single subareolar injection of methylene blue dye intraoperatively (back side of the breast), showing that pathways of lymph flow arise from the areolar region, pass through the breast tissue, and terminate at the SLNs in the axilla.

A: A blue PSLC from the areolar region, penetrating the breast tissue, to a single blue axillary SLN. B: A PSLC from the areolar region, passing through the breast tissue, diverging in retromammary tissue, and reaching two separate SLNs. (1. injection site; 2. blue PSLC; 3.SLN).