Pharyngoesophageal (Zenker's) Diverticulum
Clinical Presentation
Zenker's diverticulum typically presents with oropharyngeal dysphagia, regurgitation of undigested food, halitosis, and chronic aspiration, predominantly affecting elderly male patients 1, 2. The condition results from an acquired hypopharyngeal outpouching through Killian's dehiscence, caused by upper esophageal sphincter dysfunction and increased intrabolus pressure 3, 1.
Key symptoms to identify:
- Dysphagia (difficulty swallowing at the throat level, not chest)
- Regurgitation of undigested food
- Halitosis (bad breath from food retention)
- Chronic cough or aspiration symptoms
- Fetor oris and sour regurgitation in symptomatic cases 4
Diagnostic Approach
Confirm diagnosis with a barium swallow study, which demonstrates the characteristic posterior pharyngeal pouch communicating with the esophagus 1, 5. CT scanning may show a hypodense air-filled lesion without obvious wall at the posterior upper esophagus 5. Endoscopy can verify the diagnosis but should be performed cautiously to avoid perforation.
Treatment Recommendations
For Symptomatic Patients
Endoscopic cricopharyngeal myotomy is the preferred treatment approach for symptomatic Zenker's diverticulum, having largely replaced open surgery due to lower complication rates, shorter operative time, and faster recovery 3, 1, 6. The fundamental principle of all treatments is dividing the cricopharyngeal muscle to relieve the functional obstruction.
Consider upper oesophageal sphincter dilatation in the treatment of dysphagia with cricopharyngeal bar with or without the presence of a Zenker's diverticulum 7.
Endoscopic Options (in order of current preference):
Flexible endoscopic septum division (FESD) - widely adopted as minimally invasive, simple, and safe 3
Zenker's per oral endoscopic myotomy (Z-POEM) - newer third-space endoscopic technique expanding treatment options 3
Endoscopic stapled diverticulotomy - generally preferred rigid endoscopic approach with high success rates 6, 2
CO2 laser-assisted diverticulotomy - alternative rigid endoscopic technique 6
Flexible endoscopy - valuable option particularly for high-risk patients who are poor candidates for general anesthesia, though carries increased recurrence risk 1, 2
Open Surgery
Reserved for cases where endoscopic approaches fail or are not feasible, though associated with higher morbidity 3, 6.
For Asymptomatic Patients
Observation is sufficient for asymptomatic Zenker's diverticulum - no intervention is required 4. In one series, 12 asymptomatic patients had no complaints during follow-up periods of 1-25 years with observation alone 4.
Post-Procedure Management
When performing any dilatation or endoscopic procedure:
- Monitor patients for at least 2 hours with clear written discharge instructions 7
- Ensure patients tolerate water before discharge 7
- Provide emergency contact information for chest pain, breathlessness, or fever 7
- Do not routinely perform contrast studies unless patients develop persistent chest pain, fever, breathlessness, or tachycardia during recovery 7
Perforation Warning Signs
Suspect perforation if patients develop pain, breathlessness, fever, or tachycardia 7. While transient chest pain is common after dilatation, persistent pain warrants CT scan with oral contrast (more sensitive than conventional contrast studies) 7. Perform immediate endoscopic re-inspection if symptoms develop in the procedure room, with consideration for fully covered self-expanding metal stent placement 7.
Key Clinical Pearls
- Treatment is only indicated for symptomatic patients 2, 4
- Endoscopic approaches have gained widespread acceptance over open surgery due to superior safety profile in this predominantly elderly, frail patient population 2
- The choice between endoscopic techniques depends on local expertise, diverticulum size, and patient comorbidities 2
- Prognosis after surgical treatment is satisfactory with symptom resolution and low recurrence rates 4