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Zenker Diverticulum

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Zenker Diverticulum

Zenker diverticulum is the most common upper esophageal (pharyngoesophageal) diverticulum. It
is a false (pulsion) diverticulum that arises through the Killian triangle, a weak area in the posterior
wall of the hypopharynx.

Also called

pharyngoesophageal diverticulum

ICD-10

K22.5

Specialty

Gastroenterology

Onset

Chronic

Reviewed

July 2026

On This Page

Overview

Zenker diverticulum results from increased intraluminal pressure causing the mucosa and
submucosa to herniate through the Killian triangle. It typically presents with regurgitation and
halitosis, and is diagnosed with a modified barium swallow. Symptomatic patients are usually
treated surgically or endoscopically

Etiology & Risk Factors

Common Causes

  • Cricopharyngeal muscle dysfunction (most common)

  • Impaired relaxation of the upper esophageal sphincter

  • Increased hypopharyngeal pressure during swallowing

  • Age-related degeneration of pharyngeal muscles

  • Esophageal motility disorders (less common)

Risk Factors

  • Age > 60 years

  • Male sex

  • Cricopharyngeal dysfunction

  • Esophageal motility disorders

  • Chronic swallowing dysfunction (dysphagia)

  • Connective tissue degeneration with aging

Pathophysiology

1. Increased intraluminal pressure develops in the hypopharynx.
2. The mucosa and submucosa herniate through the Killian triangle.
3. A false (pulsion) diverticulum forms.
4. Food collects within the diverticulum, leading to characteristic symptoms.

Clinical Presentation

–Typical symptoms include:
• Regurgitation
• Halitosis

History Taking

  • Ask about:
    • Regurgitation of undigested food
    • Halitosis
    • Dysphagia
    • Duration and progression of symptoms
    • Difficulty swallowing
    • Previous episodes of aspiration or choking (if present)

Physical Examination

Physical examination is often unremarkable.
Assess nutritional status and evaluate for complications related to dysphagia if suspected.

Investigations

  • Initial Tests

    • Complete blood count (CBC) (if bleeding or malnutrition is suspected)

    • Electrolytes and renal function tests

    • Nutritional assessment (if significant weight loss or dysphagia)

    Diagnostic Investigations

    Barium Swallow (Contrast Esophagram) – First-Line Investigation

    • Investigation of choice

    • Demonstrates the diverticulum

    • Determines its size and location

    • Assesses esophageal emptying

    Upper Gastrointestinal Endoscopy (EGD)

    • Performed cautiously after imaging

    • Excludes malignancy or other esophageal pathology

    • May assist in treatment planning

    Flexible Nasoendoscopy

    • Evaluates the pharynx and larynx

    • Excludes other causes of dysphagia

    Additional Investigations

    • High-resolution esophageal manometry (if an underlying motility disorder is suspected)

    • CT neck/chest (rarely, for complicated cases or if malignancy is suspected)

Diagnosis

-Diagnosis is established by:
• Typical clinical features
• Modified barium swallow demonstrating a contrast-filled diverticular pouch

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Management

  • 1. Conservative Management

    For small, asymptomatic diverticula:

    • Observation

    • Regular follow-up

    • Dietary modification (eat slowly, chew food thoroughly, drink water with meals)

    2. Endoscopic Treatment (Preferred)

    First-line treatment for most symptomatic patients.

    Options include:

    • Endoscopic diverticulotomy (septotomy)

    • Endoscopic stapling diverticulotomy

    • Flexible endoscopic septal division (FESD)

    • Zenker’s peroral endoscopic myotomy (Z-POEM) (selected patients)

    These procedures divide the septum between the diverticulum and the esophagus, improving esophageal emptying.

    3. Surgical Treatment

    Indicated for:

    • Large diverticula

    • Failed endoscopic treatment

    • Recurrence after endoscopic therapy

    • Patients unsuitable for endoscopic procedures

    Options include:

    • Diverticulectomy with cricopharyngeal myotomy

    • Diverticulopexy with cricopharyngeal myotomy

    • Diverticular inversion (rarely)

    4. Supportive Care

    • Nutritional assessment

    • Treat aspiration pneumonia if present

    • Manage dehydration or malnutrition

    • Speech and swallowing therapy when indicated

    5. Follow-Up

    • Monitor for symptom recurrence

    • Assess swallowing function

    • Repeat endoscopy or barium swallow if symptoms recur

Complications

• Dysphagia
• Aspiration risk
• Association with esophageal squamous cell carcinoma

Prognosis

  • Symptomatic patients generally have good outcomes following surgical or endoscopic treatment,
    which relieves upper esophageal sphincter obstruction and improves swallowing.

Key Points / Clinical Pearls

• Zenker diverticulum is the most common pharyngoesophageal diverticulum.
• It is a false (pulsion) diverticulum occurring through the Killian triangle.
• Regurgitation and halitosis are the hallmark symptoms.
• Modified barium swallow is the diagnostic test of choice.
• Symptomatic patients require surgical or endoscopic treatment.
• Cricopharyngeal myotomy is the cornerstone of therapy.
• Flexible endoscopy is commonly used for medium-sized diverticula.
• Zenker diverticulum is associated with an increased risk of esophageal squamous cell carcinoma

  • National Center for Biotechnology Information (NIH). Zenker Diverticulum, StatPearls.
  • Ferreira LE, Simmons DT, Baron TH. Zenker's Diverticula: Pathophysiology, Clinical Presentation, and Flexible Endoscopic Management. Dis Esophagus. 2008;21:1-8. PMID: 18197932.
  • Cricopharyngeal Myotomy Using Grasping Scissors: Benefits of Peroral Endoscopic Myotomy in Symptomatic Zenker's Diverticulum. PMC12550744.
  • MedlinePlus, National Library of Medicine (NIH). Zenker Diverticulum: Medical Encyclopedia.
  • Bizzotto A, Iacopini F, Landi R, Costamagna G. Zenker's Diverticulum: Exploring Treatment Options. Acta Otorhinolaryngol Ital. 2013;33:219-229. PMC3773977.