Named after Friedrich Albert von Zenker (1825-1898), a German pathologist, Zenker's diverticulum is a pulsion diverticulum that arises from a muscular dehiscence between the oblique fibers of the inferior constrictor muscle and the transverse fibers of the cricopharyngeus muscle. This area is known as the Killian triangle. Zenker's diverticula most commonly appear between the 6th and 9th decades and are 2 to 3 times more frequent in men than women. The main symptom is dysphagia (difficulty in swallowing). Food retained in the diverticulum may lead to spontaneous regurgitation, bad breath and choking. As the sac grows larger, it compresses the esophagus, causing more dysphagia and aspiration. Eventually, a Zenker's diverticulum may lead to severe loss of weight and complete esophageal obstruction.