Zenker's diverticulum.
D000368:Aged; D004936:Diverticulum, Esophageal / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000473:pathology; D004947:Esophagus / Q000000981:diagnostic imaging; D005764:Gastroesophageal Reflux / Q000209:etiology; D006801:Humans; D008297:Male; D011859:Radiography