RESUMEN
Duodenal perforation can occur due to complications caused by ulcers, other inflammation or by the instrument used during the procedure such as endoscopy, endoscopic retrograde cholangiopancreatography (ERCP); however, its incidence is not high. Most cases of perforation of the lateral wall of the duodenum are acute and require immediate surgical or endoscopic treatment. Cases of chronic duodenal perforation are rarely reported. This report presents the case of a previous perforation that was discovered unexpectedly during ERCP in a patient with cholangitis due to common bile duct stones. The time of occurrence of the perforation was unknown. After medical treatment, the patient was able to return to daily life. We have reported this case along with a literature review.