Figure 4.

(a) White-light imaging endoscopy shows Barrett's esophagus. (b) Chromoendoscopy with 2% acetic acid shows “acetowhitening” reaction of the mucosa with intestinal metaplasia. (c) Magnifying endoscopy with narrow-band imaging system reveals nondysplastic mucosa presenting cerebriform or gyri-like pit pattern with superficial blood vessels regularly situated between the mucosal ridges. (d) Magnifying endoscopy with white-light imaging shows increased vascularity of mucosa breaks which appears as a villous pit pattern (e) after acetic acid spraying. (f) Magnifying endoscopy under narrow-band imaging system disclosed low-grade dysplasia with irregular/disrupted mucosal patterns and irregular vascular patterns.