A 30 yr old mail presents with complaints of dysphagia with regurgitation and foul breath. On examination, pallor is present along with bilateral lung crepitations. The most likely diagnosis is:

Zenker's diveiculum is an outpouching of the cervical esophagus. Mucosa of the esophagus protrudes through an anatomically weak area between the cricopharyngeus inferiorly and the thyropharyngeus. Zenker diveiculum often causes clinical manifestations such as dysphagia, regurgitation, cough, halitosis. A simple barium swallow will normally reveal the diveiculum. Endoscopy should not be performed due to the risk of perforating the diveiculum. Surgery is indicated for large diveicula.