<prompt> All except one are true regarding Barretts esophagus-More incidence of sq. cell caMetaplasiaColumnar epitheliumInvolves lower oesophagus  <response>: There is an increased incidence of adenocarcinoma in Barrets esophagus. Barretts esophagus is a premalignant condition with an increased incidence of adenocarcinoma of esophagus. The risk of adenocarcinoma increases with increasing length of columnar-lined epithelium Also, remember Barretts esophagus is the single most impoant risk factor for adenocarcinoma of esophagus. The adenocarcinoma develops at the squamo-columnar junction -85 or within 2 cm of the junction. Ref : Bailey Love 25e p1022 