Neonatal Duodenal Duplication Cyst

A 2800 gram baby boy was born with a prenatal diagnosis of a choledochal cyst; he was admitted to NICU for further evaluation. Clinically he was jaundiced with a palpable abdominal mass in the right hypochondrium. Choledochal and duplication cysts were differential diagnoses. Ultra-sonography by an experienced sonographer or a CT scan is usually sufficient for diagnosis. Communicating duplication cyst can easily be diagnosed on barium meal follow through which may show contrast in the cyst; isotope scanning may show areas with ectopic mucosa if lining the cyst.[1-3] In this case, the CT scan with intravenous contrast showed an intraperitoneal cystic lesion (10cm x 7cm x 6cm) in diameter extending from the sub hepatic region down to the pelvic inlet, with a thin non-enhancing wall and fluid attenuation with a significant mass effect on adjacent structures and bowel.