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