Laser endoscopy.
D004724:Endoscopy; D004938:Esophageal Neoplasms / Q000601:surgery; D006471:Gastrointestinal Hemorrhage / Q000601:surgery; D005770:Gastrointestinal Neoplasms / Q000601:surgery; D006801:Humans; D053685:Laser Therapy; D007834:Lasers / Q000009:adverse effects; D008173:Lung Diseases, Obstructive / Q000601:surgery; D008175:Lung Neoplasms / Q000601:surgery; D014134:Tracheal Neoplasms / Q000601:surgery; D014135:Tracheal Stenosis / Q000601:surgery