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Paraduodenal hia is the most common intal hia. The clinical symptoms of paraduodenal hia may be intermittent and nonspecific. Therefore, it is difficult to diagnose preoperatively. Abdominal computed tomography (CT) scan currently plays an important role in the evaluation and management of paraduodenal hia before surgical operation. We report one unique case of preoperatively diagnosed left paraduodenal hia complicated by advanced ascending colon cancer and reviews of Japanese literature.