High Resolution Virtual Chromoendoscopy Versus Seattle Protocol for the Surveillance of Barrett's Esophagus

Inclusion Criteria: * Male or Female with Age above ≥ years old; * Female of childbearing potential must use appropriate method(s) of contraception during the clinical trial (i.e.: Intrauterine Device, pill, implant,sexual abstinence); * Dysplastic Barrett's Esophagus preferably labelled "flat mucosal dysplasia"; * Patient requiring esophageal endoscopy as part of their regular monitoring; * Affiliated to social security; * Patient received Patient Information Form and accepted to participate to the study. Exclusion Criteria: * Previously treated Barrett's Esophagus; * Known invasive esophageal adenocarcinoma; * Contraindication to general anesthesia; * Ongoing clopidogrel or anticoagulant therapy or coagulation disorder (platelet count \< 50 000/mm3, Prothrombin time ratio \<50%); * Poor general health status precluding subsequent follow up of Barrett's Esophagus ; * For female: pregnancy or breastfeeding; * Adults under a legal protection regime (guardianship, trusteeship, "under judicial protection"). * Ongoing participation in another study requiring an intervention on Barrett's Esophagus during patient's participation in Converse study