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We have been developing automatical abdominal lymph node detection methods to aid pre-operating diagnosis for surgery of colorectal or stomach cancers. Our purpose is to achieve the aid for resection area decision in pre-operative diagnosis and the aid for intra-operation by displaying the detected lymph nodes. We have proposed methods for detecting lymph nodes based on estimation and classification of local intensity structure. In this paper, we improve false positive reduction process using the feature selection methods. 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