Killian's dehiscence (also known as Killian's triangle, Laimer triangle, Laimer-Killian triangle, or Laimer-Haeckermann area) is a triangular area in the wall of the pharynx between the thyropharyngeus part of the inferior constrictor of the pharynx and the cricopharyngeus muscle, also of the inferior constrictor muscle of the pharnyx (also see Pharyngeal pouch).
Pharyngeal pouches typically cause difficulty in swallowing after the first mouthful of food, with regurgitation of the pouch contents.