<prompt> Adenocarcinoma in oesophagus occurs inMidline oesophagusUpper oesophagusBarretts esophagusZenkers diveiculum  <response>: BARRETTs ulcer is an ulcer in columnar epithelium lined Barretts oesophagus. It is more prone for Bleeding, Perforation, and Adenocarcinoma of oesophagus very high, more than 40 times. Treatment for Barretts ulcer is endoscopic biopsy and resection. Reference: SRBs Manual of Surgery, 6th Edition, page no 788. 