Imaging of omphalomesenteric duct remnants and related pathologies in children.

The omphalomesenteric duct (OMD) or the vitelline duct (VD) is the embryologic communication between the yolk sac and the primitive midgut. OMD or VD anomalies are a group of defects resulting from failure of involution of the OMD. Meckel diverticulum is the most common anomaly that results from failure of resorption of the OMD. Other less common anomalies seen in children include OMD fibrous band, fistula, sinus tract, cyst, and umbilical polyps. These OMD remnants can have variable clinical manifestations such as umbilical discharge, small bowel obstruction, gastrointestinal tract bleeding, or acute abdomen. This pictorial essay reviews the clinical presentation and imaging findings of the common and not so common complications of OMD remnants in the pediatric population.