Congenital esophageal diverticulum is a rare, non-syndromic malformation of the esophagus, present at birth, and characterized by a false diverticulum, most often located in the upper, posterior esophagus. Many patients are asymptomatic, but respiratory distress, food regurgitation, dysphagia, chest pain, aspiration pneumonia and discomfort are typical presenting manifestations. The disease is congenital esophageal diverticulum (MONDO_0019620, a Monarch Disease Ontology identifier). Also known as: congenital esophageal pouch.