# Pharyngeal Pouch > Pharyngeal pouch (Zenker diverticulum) for NEET-PG Surgery: Killian triangle, regurgitation, aspiration, stapled diverticulotomy, myotomy. - Canonical URL: https://prepelephant.com/topics/neet-pg/surgery/pharyngeal-pouch - Exam / course: NEET-PG · Subject: Surgery - Publisher: PrepElephant (https://prepelephant.com) — Prepared and reviewed by the PrepElephant Academic Review Team - First published: 2026-10-02 - Last updated: 2026-10-02 - How to cite: "Pharyngeal Pouch", PrepElephant, https://prepelephant.com/topics/neet-pg/surgery/pharyngeal-pouch ## Direct answer Herniation through Killian's dehiscence — the weak point between the oblique thyropharyngeus and the transverse cricopharyngeus fibres of the inferior constrictor — creates a pharyngeal pouch (Zenker diverticulum), a pulsion diverticulum presenting classically in an elderly patient with dysphagia, regurgitation of undigested food eaten hours earlier, gurgling on swallowing, halitosis, weight loss and recurrent aspiration pneumonia. Barium swallow confirms the posterior outpouching, and treatment is cricopharyngeal myotomy, performed either endoscopically with a stapled diverticulotomy (the Dohlman procedure, standard for pouches above about 3 centimetres) or through an open excision of the sac with myotomy for huge or recurrent pouches. Because stagnation over years can cause squamous carcinoma within the pouch, new pain, bleeding or rapid progression demands endoscopic review. ## What you must remember - **Site and mechanism:** pulsion herniation through Killian's triangle due to uncoordinated, prematurely contracting or failed relaxation of cricopharyngeus — a raised upper oesophageal sphincter pressure problem, not a weakness of the whole constrictor. - **Demographics:** patients over 60, more often men; in India typically elderly men presenting after years of "vomiting food at night" mislabelled as reflux. - **Symptom cluster:** dysphagia, regurgitation of undigested food (often hours later and positional), gurgling sounds, foul breath, visible neck bulge that empties on pressure, and aspiration chest infections — the sequence worth reproducing in a viva. - **Diagnosis:** barium swallow is the investigation of choice; endoscopy and bougienage are risky blind procedures because the instrument can enter and perforate the pouch. - **Endoscopic stapled diverticulotomy (Dohlman):** divides the common septum between pouch and oesophagus, effectively performing the myotomy and leaving the pouch spillover-free; quick, low-morbidity, unsuitable for pouches smaller than about 3 centimetres. - **Open surgery:** excision of the sac plus cricopharyngeal myotomy via a left neck incision — for giant, recurrent or endoscopically inaccessible pouches; complications include fistula, recurrent laryngeal nerve injury and mediastinitis. - **Malignant risk:** long-standing stasis predisposes to squamous carcinoma within the pouch — quoted around 1 percent or less; bleeding or pain in a known pouch warrants reassessment. ## A typical exam case A 74-year-old man reports three years of sticking of food, nightly regurgitation of recognizable eaten food, a 6-kilogram weight loss and two hospital admissions for right lower lobe pneumonia. The clinical story alone nearly settles the diagnosis. Barium swallow shows a barium-filled posterior pouch at C5-C6 hanging beside the oesophagus. He is offered endoscopic stapled diverticulotomy: a diverticuloscope exposes the septum, a linear stapler divides it, and both the pouch neck and the cricopharyngeus bar are opened in one staple line — oral intake usually restarts within a day. Had the pouch been small, under about 3 centimetres, the stapler cannot seat properly and the choice shifts to open myotomy or a laser or needle-knife myotomy. Had he presented with severe pain and fulminant sepsis, free perforation of an inflamed pouch would be the emergency — conservative treatment with antibiotics, or drainage, would precede any definitive procedure. ## How the exam frames it Three stems recur. First, the anatomy question — the weak area is between thyropharyngeus and cricopharyngeus, and options offering "between the two cricopharyngeus bundles" or "above the upper oesophageal sphincter" are distractors. Second, the aspiration chain — an elderly man with recurrent chest infections plus nocturnal regurgitation of undigested food points to the pouch, not to gastro-oesophageal reflux, because reflux brings acid, not yesterday's rice. Third, the treatment escalation — endoscopic stapling for most, open excision with myotomy for the giant or recurrent sac; and any stem hinting at a stapler too large for a 2-centimetre pouch expects you to choose open myotomy. The carcinoma-within-pouch fact is a favourite one-liner. ## Frequently asked questions ### Through which anatomical weak point does a pharyngeal pouch herniate? Killian's dehiscence, between the oblique fibres of thyropharyngeus and the transverse fibres of cricopharyngeus, at the junction of the pharynx and oesophagus. ### Which investigation diagnoses a pharyngeal pouch? Barium swallow, showing the posterior outpouching filled with contrast; blind endoscopy is avoided initially because the scope can enter and perforate the pouch. ### What is the Dohlman procedure? Endoscopic stapled diverticulotomy — division of the common wall between pouch and oesophageal lumen with a linear stapler, simultaneously achieving a cricopharyngeal myotomy. ### Why does a pharyngeal pouch cause recurrent pneumonia? Stagnant food in the pouch spills over into the larynx during sleep, causing chemical and infective aspiration pneumonia, typically in dependent lung segments. ### When is open surgical excision preferred over stapling? For very small pouches where the stapler cannot be seated, for giant pouches, and for recurrences after endoscopic treatment — with a cricopharyngeal myotomy added in every open case.