creation date: 2026-06-04 16:58
tags: Pathologies
Zenker Diverticulum
Background
Definitions
Zenker diverticulum (ZD) is a sac-like outpouching of the mucosa and submucosa through Killian’s triangle. They are the most common type of esophageal diverticula, defined as a posterior, false diverticulum proximal to the cricopharyngeal muscle.
True diverticula: contains all layers of esophageal wall
False diverticula: contains only mucosa and submucosa
Intramural diverticula: confined to the submucosa
Esophageal diverticula are classified based on their location:
Near upper esophageal sphincter
- ZD – above the cricopharyngeus muscle, extending posteriorly
- Killian-Jamieson diverticulum – below cricopharyngeus muscle, extending anterolaterally
- Laimer’s diverticulum – below the cricopharyngeus muscle, extending posteriorly
Near the midpoint of esophagus
- Traction diverticulum
Near above the lower esophageal sphincter
- Epiphrenic diverticulum
Pathogenesis
ZD occurs in the muscular wall of the hypopharynx at a region of natural weakness known as Killian’s triangle. Killian’s triangle is more prevalent in males than female and correlates with body dimensions and length of the larynx.
Some circumstance that predisposes herniation is typically present, such as abnormal upper esophageal sphincter function, motility, or shortening. GERD or other causes of impaired bolus passage may result in increased intrabolus pressures.
The presence of the diverticulum may cause symptoms as the openings of larger ZD are aligned with the axis of the pharynx and thus food and other ingestants may preferentially divert into the diverticulum.
Clinical Presentation
Signs & Symptoms
Symptoms can range from none to oropharyngeal dysphagia. The latter may manifest as:
- Difficulty initiating swallow
- Food stuck immediately after swallow
- Nasopharyngeal regurgitation, aspiration, sensation of residual food in pharynx
- Oral dysfunction (eg. drooping, food spillage)
- Pharyngeal dysfunction (eg. coughing, choking, dysphonia)
History & Physical Exam
Diagnosis
Criteria
Diagnosis is made on barium swallow examination.
Work-up
Upper endoscopy
Note required to confirm but often recommended to rule out alternative diagnoses or concurrent malignancy.
Differential
Other causes of dysphagia are described separately.
Red Flags / Complications
Complications may arise from the disease itself, iatrogenic injury due to NG or endoscope insertion, or by surgical procedures used to treat.
- Aspiration pneumonia
- Ulceration and bleeding due to retained medication or foreign body
- Fistula between diverticulum and trachea lumen
- Vocal cord paralysis due to pressure from retained food
- Squamous cell carcinoma (rare)
Management
Management is only indicated if patient is symptomatic. Asymptomatic cases can be managed expectantly.
The first line choice is typically flexible endoscopy, with two types used based on size of the diverticulum:
- Zenker’s peroral endoscopy myotomy (Z-POEM) / peroral endoscopy septotomy (POES) – preferred for diverticula <2 cm
- Flexible endoscopy septotomy (FES) – preferred for diverticula >2 cm
If flexible endoscopy is not available or not feasible, other options are:
- Rigid endoscopy
- Open transcervical surgery