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Duplications of the alimentary tract are uncommon congenital malformations that can present diagnostic difficulties.We report a rare case of a cystic colonic duplication in a female adult.Preoperative investigations were suggestive of pancreatic tumor.The diagnosis was established based on the histopathological examination of the resected specimen.We concluded that,though uncommon,intestinal duplication should be considered in differential diagnosis of abdominal mass.