Zenker's Diverticulum
Zenker's diverticulum (also known as pharyngeal pouch or hypopharyngeal diverticulum) is a pulsion diverticulum that herniates through Killian's dehiscence, an area of muscular weakness in the posterior pharyngeal wall between the oblique fibers of the inferior pharyngeal constrictor and the horizontal fibers of the cricopharyngeus muscle. It is the most common type of pharyngoesophageal diverticulum, accounting for approximately 70-80% of cases.[1]
Zenker's diverticulum predominantly affects elderly individuals (>70 years) with a male predominance (2:1 to 3:1). The incidence is approximately 2 per 100,000 per year in the Western world. The condition presents with progressive dysphagia, regurgitation of undigested food, halitosis, and aspiration. Without treatment, symptoms typically worsen over time due to progressive enlargement of the diverticulum.[2]
- History
Friedrich Albert von Zenker (1825-1898), a German pathologist, provided the first comprehensive description of this condition in 1877, along with Hugo Wilhelm von Ziemssen. Zenker systematically described the clinical presentation, anatomical location, and pathological features of the pharyngeal pouch, establishing it as a distinct clinical entity.
Gustav Killian subsequently characterized the anatomical weakness (Killian's dehiscence) through which the diverticulum herniates in 1908. Surgical treatment evolved from external open approaches in the early 20th century to endoscopic techniques introduced in the 1960s and refined in subsequent decades.
Pathophysiology
Relevant Anatomy
Zenker's diverticulum occurs as a result of a herniation of the esophageal mucosa through Killian's triangle. Killian's triangle is bounded superiorly by the inferior pharyngeal constrictor muscle (specifically the thyropharyngeus muscle) and inferiorly by the cricopharyngeus muscle.
Disease Etiology
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Histology
Histological section of a Zenker's diverticulum will reveal only the luminal mucosal layer and submucosal tissues. The lack of a muscular layer makes this a pseudodiverticulum rather than a true diverticulum.
Pharyngoesophageal_diverticulum_--_low_mag
Diagnosis
Patient History
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Physical Examination
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Laboratory Tests
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Imaging
Fluoroscopy, such as a barium esophagram, is the preferred imaging modality to characterize Zenker's diverticula. Modified barium swallow studies may also be beneficial if the radiology technician widens the view to include the entire cervical esophagus.
Differential Diagnosis
Other diverticula of the pharyngeal and esophageal mucosa should be considered:
Management
Medical Management
There is no medical management that will significantly impact the development or worsening of a Zenker's diverticulum. Medical management would be limited to the treatment of sequelae of the diverticulum, such as aspiration pneumonia.
Surgical Management
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Outcomes
Complications
The main complication associated with a Zenker's Diverticulum is aspiration secondary to reflux of contents of the diverticulum. Patients will also often complain of halitosis.
Prognosis
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References
- ↑ Aiolfi A, Scolari F, Saino G, et al. Systematic review and meta-analysis of Zenker's diverticulum management. J Gastrointest Surg. 2019;23(10):2095-2110.
- ↑ Ferreira LE, Simmons DT, Baron TH. Zenker's diverticula: pathophysiology, clinical presentation, and flexible endoscopic management. Dis Esophagus. 2008;21(1):1-8.