[Petersen's hernia after laparoscopic gastric bypass].

Background: RYDG is the second most prevalent bariatric operation worldwide in terms of surgical treatment for the management of obesity and its comorbidities; however, one of its complications is the development of Petersen's space hernia. Currently there is no specific cause for their development since, based on studies published worldwide, they have an unpredictable behavior in each individual.

Objective: To establish the prevalence of Petersen's hernia and risk factors for its development.