Isosulfan blue. Definition

Medical Definition: Isosulfan blue

Dye made in the laboratory to help identify the sentinel lymph node (the first lymph node affected by cancer that spreads from a primary tumor). Isosulfan blue is injected into the edge of the tumor and travel through the lymph fluid to lymph nodes near the tumor. The sentinel lymph node is identified when removed lymph nodes were stained with blue dye and cancer cells look under a microscope.

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