Pulsion diverticula (mucosa and submucosa only) found in cervical esophagus in posterior midline between fibers of inferior pharyngeal constrictors and just proximal to cricopharyngeus; key defect is dysfunction of cricopharyngeus muscle. Common presenting features are regurgitation of putrid food, halitosis, aspiration, pneumonia, and dysphagia. Treatment is excision or tacking via left neck incision to allow dependent drainage of contents. Condition usu. occurs after 50 years of age.