Introduction: Intestinal duplications are rare malformations and hail sites are the most common. Today, the diagnosis is made in antenatal because of the performances of antenatal ultrasound.
Observation: This was a 15-month-old male infant received for constant crying, vomiting and increased abdominal volume that had been evolving for two weeks. An abdominal ultrasound was performed and objectified an intraperitoneal cyst formation of 30 x 27 mm, surrounded by a stratified wall and contiguous to a digestive loop. Surgery was performed and confirmed the existence of non-communicating ileal duplication.
Conclusion: Intestinal duplication is a rare malformation. Ultrasound is often sufficient for diagnosis based on the presence of a characteristic double-walled cystic mass.