How are the sentinel nodes defined in lymphoscintigraphy (sentinel lymph node mapping) for breast cancer?

Updated: Dec 13, 2018
  • Author: Durre Sabih, MBBS, MSc, FRCP(Edin); Chief Editor: Mahan Mathur, MD  more...
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Answer

Answer

The sentinel node is the first node to receive metastatic deposits in a malignancy. Lymphoscintigraphy is an important procedure because if the sentinel node is free of metastasis, subsequent nodes are also likely to be free of disease. The sentinel node is generally defined as follows:

  • The node closest to the primary lesion

  • The node with a radioactive channel leading to it

  • The node with the highest count rate on lymphoscintigraphic imaging and probe counting

  • The first node visible on lymphoscintigraphic imaging

  • The blue node on dye injection technique

  • The node with a blue channel leading to it


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