Diverticulum of upper esophagus

A Zenker's diverticulum, also pharyngeal pouch, is a diverticulum of the mucosa of the human pharynx, just above the cricopharyngeal muscle (i.e. above the upper sphincter of the esophagus). [Source: Wikipedia ]

Synonyms
Upper esophageal diverticulum
Is A
Esophageal diverticulum
May Be Caused by
 Common
Zenker diverticulum
 Uncommon
Killian-Jamieson diverticulum
Pharyngocele
Traction diverticulum of upper esophagus