A pharyngeal pouch is a pulsion diverticulum of the pharyngeal mucosa through Killian's dehiscence, an area of weakness between the two parts of the inferior pharyngeal constrictor - the thyropharyngeus and the cricopharyngeus - at their posterior margin.
The pouch probably arises as a result of a relative obstruction at the level of the cricopharyngeus. At first, it develops posteriorly but then it protrudes to one side, usually the left. As it enlarges, it displaces the oesophagus laterally.
Add information to this page that would be handy to have on hand during a consultation, such as a web address or phone number. This information will always be displayed when you visit this page