Colorectal cancer lymph node staining by activated carbon nanoparticles suspension in vivo or methylene blue in vitro

Figure 2 Methylene blue in vitro used as a tracer in colorectal cancer lymph node detection. A: The main artery of the specimen was isolated and methylene blue (MB) was injected into the vessel. Lymph nodes can easily be identified, arrow points to the blue dyed lymph nodes; B: MB migrating to the lymph node (hematoxylin and eosin, ×100).