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The most frequent LN metastatic region was the hepatico-duodenal ligament for all invasion categories, and the LN metastatic region was not related to the survival. In peripheral ICC, LND did not affect the survival. By contrast, hilar/intermediate ICC LN+ had a better survival than did peripheral ICC LN+, and the 3-year OS was ≥ 20%. LN metastasis depended on the ICC invasion category in addition to the tumor number, which affected patients' survival and the need for LND. In hilar-type disease, LN dissection may contribute to the sur