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This is another “stumper.” According to the Stedman Medical Dictionary:

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…the first lymph node to receive lymphatic drainage from a malignant tumor; the sentinel node is identified as the first to take up a radionuclide or dye injected into the tumor; increasingly used in operations for melanoma and breast cancer; if the sentinel node is free of metastasis, more distal nodes are also free. See Also: signal lymph node. Syn: sentinel node.

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