title: [Gastroenterological endoscopy with staining].
mesh_terms: D003937:Diagnosis, Differential; D004379:Duodenal Neoplasms / Q000175:diagnosis; D004381:Duodenal Ulcer / Q000175:diagnosis; D004384:Duodenoscopy / Q000379:methods*; D006801:Humans; D008751:Methylene Blue; D013194:Staining and Labeling / Q000379:methods
chemical_list: D008751:Methylene Blue