Situs inversus abdominis in association with duodenal obstruction and internal hernia.

Persistent bile-stained vomiting in a neonate led to a radiologic workup that revealed the existence of a situs inversus and a partial duodenal obstruction. A duodenal diaphragm with a central aperture was diagnosed. Surgery confirmed the preoperative diagnosis. In addition, an annular pancreas with an anterior gap and a right parietocolic internal hernia containing all the small bowel were discovered. Embryologic aspects, therapeutic options, and the literature were discussed.