Duodenal diverticulum is not a rare disease, with a frequency of 1-3% in radiologic review and of 2.8-20% in pathology review; The spontaneous perforation of a perivaterian duodenal diverticulum is a rare complication, with about 100 cases reported in the literature. The post-traumatic perforation of a perivaterian diverticulum is an exceptional event, reported in single cases of the oriental literature. The authors report their personal experience about two cases of diverticular duodenal perforation, one spontaneous, the other post-traumatic, discussing the surgical problems that this rare complication present.