Zenker diverticulum is a pouch in the back of pharynx (posterior pharyngeal constrictor muscles), which accumulates undigested food that has usually been eaten several days before.
Zenker diverticulum usually occurs with older age and presents regurgitation of undigested food, bad breath and oropharyngeal dysphagia mainly to solids.
The diagnosis is confirmed by barium studies. Endoscopy and nasogastric tubes are contraindicated due to risk of pharyngeal perforation.
Treatment is with surgical resection of the pouch