The correct answer is:
E) Zenker diverticulum
This patient has several classic findings of Zenker diverticulum, including dysphagia, regurgitation of undigested food, halitosis, weight loss, and gurgling sounds during swallowing. The most important clue is regurgitation of undigested food hours after eating. Unlike esophageal obstruction, in which food generally progresses into the esophagus before becoming obstructed, Zenker diverticulum creates a pouch that traps food above the upper esophageal sphincter. Retained food may later be regurgitated, often long after a meal.
Zenker diverticulum is a pulsion diverticulum that develops through an area of muscular weakness known as Killian’s triangle. Impaired relaxation or discoordination of the cricopharyngeal muscle increases hypopharyngeal pressure during swallowing, causing mucosal herniation. Most patients are older adults and present with dysphagia, chronic cough, aspiration, halitosis, or regurgitation of undigested food.
A high-yield Step 2 pearl is that Zenker diverticulum increases the risk of aspiration pneumonia due to retention of food and secretions within the diverticular pouch. Diagnosis is typically established with a barium swallow study. Endoscopy is generally avoided as an initial diagnostic test because of the risk of perforation within the diverticulum. Symptomatic patients are usually treated with endoscopic or surgical diverticulotomy.
Answer choice A: Achalasia, is incorrect.
Achalasia causes progressive dysphagia to both solids and liquids due to impaired relaxation of the lower esophageal sphincter. Regurgitation may occur, but the hallmark findings of halitosis, neck gurgling, and retention of food within a pharyngoesophageal pouch are more characteristic of Zenker diverticulum.
Answer choice B: Diffuse esophageal spasm, is incorrect.
Diffuse esophageal spasm typically causes intermittent dysphagia and substernal chest pain. Patients do not usually experience regurgitation of undigested food hours after eating or prominent halitosis.
Answer choice C: Esophageal adenocarcinoma, is incorrect.
Esophageal adenocarcinoma can cause progressive dysphagia and weight loss, making it a tempting distractor. However, it would not explain chronic regurgitation of retained food, halitosis, or gurgling sounds in the neck.
Answer choice D: Gastroesophageal reflux disease, is incorrect.
GERD commonly causes heartburn and regurgitation of acidic gastric contents. It does not produce a pharyngoesophageal pouch or retention of undigested food.
Key Learning Point
Zenker diverticulum is a pharyngoesophageal diverticulum that presents with dysphagia, halitosis, aspiration risk, and regurgitation of undigested food. Diagnosis is typically made with a barium swallow study.
