Inclusion Criteria:  Adult patients presenting Barrett's esophagus of a size between 2 cm and 6 cm in the height of the longest tonguea with low to high grade dysplasia that is histologically proven a The total height of the BE is evaluated according to the Prague classification, with the height of the circumferential segment between 0 cm (non-circumferential segment) and 6 cm (segment shaped like a full sleeve for 6 cm), referred to as C0 to C6, and the height of the longest tongue between 2 cm and 6 cm (M2- M6). Patients must have signed the consent form in order to participate in the study Patients are pre-included (signature of consent) before the histological confirmation of dysplasiab that allows the patient to be included in the study.  Exclusion Criteria:  Individuals over 85 years old Women who are pregnant, breastfeeding or in labour Individuals in detention through judicial or administrative decision Individuals who are the subject of psychiatric treatment under duress Individuals who are subjects of legal protection measures Individuals who are in no state to give their consent Individuals who do not understand French or do not know how to read Individuals who are not part of a social security program or benefit from such a scheme Those with active peptic and/or radiation-induced or complicated esophagitis at the time of treatment Presence of a visible lesion that is suspected to be early esophageal cancer or cancer proven by biopsies Anterior resection of superficial or invasive carcinoma using endoscopic mucosal resection (EMR) or endoscopic submucosal dissection (ESD) with invasion of the lateral and/or deep margin, poorly differentiated cancer or sub-mucosal invasion > 500µm (pT1b) All preliminary ablation treatments or dilation for esophageal stenosis Significant esophageal stenosis: cannot be passed with a standard gastroscope Presence of esophageal varices or portal hypertension Anticoagulant treatment that cannot be stopped before the intervention (excluding 75 mg per day of aspirin in single-drug treatment) or any haemostasis problems that cannot be corrected Having a contraindication regarding anaesthesia Patients incapable of taking proton pump inhibitors (PPIs) orally.