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Right paraduodenal hernia is an unusual congenital malformation that causes intestinal obstruction. It is seldom diagnosed preoperatively and a small bowel follow-through series is the best diagnostic method. However, multidetector computed tomography (MDCT) can be an alternative diagnostic method. We report the first case of right paraduodenal hernia that was diagnosed preoperatively by MDCT. A 15-year-old boy presented with right lower abdominal pain, nausea and vomiting. Abdominal MDCT with coronal reformation images clearly revealed encapsulated small bowel loops in the right side of the abdomen and displacement of the ascending colon to the left side. He received surgical repair and recovered uneventfully.