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An 8-month-old boy with abdominal pain. a Longitudinal grey-scale US image showing a cystic lesion with an incomplete septum inside (small white arrows), next to the terminal ileum (big arrow). The “Y” sign is shown (dashed-line arrow). b US image obtained a few seconds later: peristalsis of the cyst causes small angulation of the contour and changes shape (black star). c Surgical findings: ileal duplication cyst
