A patient complains of pain in the upper poion of his neck on swallowing. He occasionally regurgitates undigested food sholy after eating. Which of the following is the most likely etiology of his problems?

Zenker's diveiculum False diveiculum Formed by herniation of mucosa at junction of pharynx & esophagus in posterior hypopharyngeal wall. Features Halitosis Regurgitation of previous day food If diveiculum fills completely with food,can cause dysphagia or obstruction of esophagus. Mallory-Weiss tear (option A) - Mucosal tear below gastroesophageal junction secondary to repeated, forceful vomiting; often seen in alcoholics. Schatzki rings (option C) are mucosal rings found in distal esophagus at squamocolumnar junction. Traction diveicula (option D)- In contrast to a Zenker's diveiculum, this is usually asymptomatic & are true diveicula involving all of layers of esophagus. They are typically caused by adherence of esophagus to scarred mediastinal structure.