Annular pancreas in adults. A report of two cases and a review of the literature.

Annular pancreas is an uncommon developmental abnormality of the ventral pancreas. Half of all patients present in adulthood. Abdominal pain and duodenal obstruction are the commonest presenting features. Despite newer imaging modalities, the diagnosis is mostly made at surgery. We report on two patients and review the embryology, presentation, diagnosis and the current surgical management options of annular pancreas.