Abstract: Heterotopic gastric mucosa (HGM) is characterized by islands of gastric columnar epithelium and is regarded as a congenital condition. The prevalence is estimated to be approximately 0.1--10%. Although most affected patients are asymptomatic, HGM could clinically manifest with globus sensation, acid taste, dysphagia, and regurgitation. In addition, HGM could rarely be the origin of malignant progression to esophageal adenocarcinoma. In this article, the video focuses on the technique and application of advanced endoscopic imaging for the characterization of HGM in the esophagus, including dye-based and dye-less chromoendoscopy. This article is part of an expert video encyclopedia.

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