A circumscribed sacculation of the oesophageal wall. These can be divided into '''congenital''' or '''acquired'''. Congenital diverticula are due to a herniation of the mucosa through a muscularis defect. Acquired diverticula can be subdivided into: | A circumscribed sacculation of the oesophageal wall. These can be divided into '''congenital''' or '''acquired'''. Congenital diverticula are due to a herniation of the mucosa through a muscularis defect. Acquired diverticula can be subdivided into: |