[Endo-lumen vaterian diverticulas of the duodenum]

The authors report an unusual personal case of a diverticulum of Vater projecting into the lumen of the duodenum. The authors comment on the clinical, pathological and pathogenic findings of this embryological abnormality. Finally, they recall a few rules to avoid operative complications by a routine search for the ratios between the diverticulum of the duodenum and the papilla or the bile and pancreatic ducts.