<prompt> Dohlmans procedure is used inRectal prolapsedEsophageal achalasiaCA oesophagusZenkers diveiculum  <response>: Zenkers diveiculum is a protrusion of mucosa through killians dehiscence, a weak area of the posterior pharyngeal wall between thyropharyngeus oblique fibres and cricopharyngeus transverse fibres of the inferior constrictor muscle of the pharynx. It is a pulsion diveiculum. Dohlmans approach is minially invasive endoscopic technique wherein pouch is excised using double lipped endoscopy. Cautery or laser is used. It is a quicker procedure with shoer duration of anaesthesia and faster recovery. Reference : page 433-34 SRBs manual of surgery 5th edition 