![]() If cancer is found, the surgeon may remove additional lymph nodes, either during the same biopsy procedure or during a follow-up surgical procedure. The sentinel node is then checked for the presence of cancer cells by a pathologist. ![]() Once the sentinel lymph node is located, the surgeon makes a small incision (about 1/2 inch) in the overlying skin and removes the node. The surgeon then uses a device to detect lymph nodes that contain the radioactive substance or looks for lymph nodes that are stained with the blue dye. To do so, a surgeon injects a radioactive substance, a blue dye, or both near the tumor. First, the sentinel lymph node (or nodes) must be located.
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