2.1.1
Barrett's oesophagus is a condition characterised by abnormal epithelium of the oesophagus. In some patients, Barrett's oesophagus may progress, through metaplasia and dysplasia, to oesophageal adenocarcinoma. Cancer risk is higher for patients with high-grade dysplasia (HGD; some of whom may already have developed early-stage cancer) and lower for patients with low-grade dysplasia (LGD) or no dysplasia.