Gastrointestinal duplication cysts are spherical or tubular cystic structures that are lined by gastrointestinal epithelium and muscularis, and are usually attached to the gastrointestinal tract. Enteric duplication cysts most commonly occur in the distal ileum (as in our case), followed by the distal esophagus, stomach, and jejunum. They usually present during the first year of life (our patient was 9 months old).
Fluoroscopic contrast studies usually reveal an intraluminal, intramural, or extrinsic mass. Ultrasound typically shows a bowel signature, with inner hyperechoic and outer hypoechoic rings. In cases of suspected ectopic gastric mucosa (e.g., Meckel diverticulum), 99mTc-pertechnetate can be a helpful problem solving modality.
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