Diverticulum of mid esophagus

Barrett's esophagus is a condition in which there is an abnormal (metaplastic) change in the mucosal cells lining the lower portion of the esophagus, from normal stratified squamous epithelium to simple columnar epithelium with interspersed goblet cells that are normally present only in the small intestine, and large intestine. This change is considered to be a premalignant condition because it is associated with a high incidence of further transition to esophageal adenocarcinoma, an often-deadly cancer.The main cause of Barrett's esophagus is thought to be an adaptation to chronic acid exposure from reflux esophagitis. [Source: Wikipedia ]

Synonyms
Mid esophageal diverticulum
Is A
Esophageal diverticulum
May Be Caused by
 Common
Acquired pulsion diverticulum
Traction diverticulum of mid esophagus
 Uncommon
Congenital pulsion diverticulum