Newborn with a palpable abdominal mass

US of duodenal duplication cyst
AXR AP (above left) and AXR left lateral decubitus (below left) show a midline abdominal mass displacing the bowel inferiorly and to the left side of the abdomen. Transverse (above right) and sagittal (below right) US of the abdomen show a complex cystic mass in a subhepatic location. There was no suggestion of a hyperechoic inner layer of the cystic mass.

The diagnosis was duodenal duplication.