You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Adenocarcinoma in oesophagus occurs in and explain in detail?
BARRETT's ulcer is an ulcer in columnar epithelium lined Barrett's oesophagus. It is more prone for Bleeding, Perforation, and Adenocarcinoma of oesophagus( very high, more than 40 times). Treatment for Barrett's ulcer is endoscopic biopsy and resection. Reference: SRB's Manual of Surgery, 6th Edition, page no= 788.