Abstract: Two adult patients with intestinal duplication malformation admitted in the group did not show typical clinical symptoms.One of the patients was diagnosed with abdominal pain and was found to have pelvic space-occupying lesions by abdominal Computed Tomography, which could not be clearly diagnosed before surgery, and was finally diagnosed as intestinal duplication malformation by intraoperative exploration; the other patient was diagnosed with duplication of bowel after B-mode Ultrasonography of the uterus and bilateral adnexa revealed a cystic mass above the uterus, which was then considered as duplication of bowel by Magnetic Resonance Imaging of the pelvis and finally diagnosed with duplication of bowel by intraoperative exploration.Both patients underwent surgical treatments and recovered from the hospital successfully.Eventually Intestinal duplication malformation is a rare congenital malformation of the digestive tract, the treatment of which is mainly concentrated in childhood.Adult cases are not only rare, but also have complex clinical manifestations and lack of specificity.Currently, Computed Tomography and B-mode ultrasonography are the main preoperative diagnostic tools, but the accuracy is still unsatisfactory.Surgical resection is the treatment of choice after diagnosis.

Key words: intestinal duplication, congenital malformation, surgical treatment, case report