Endoscopic identification of endoluminal esophageal landmarks for radial and longitudinal orientation and lesion location

Figure 6 Usefulness of the landmarks for longitudinal orientation. Esophageal landmarks are represented in colored circles: cricopharyngeus (blue circle), left main bronchus (red circle), left atrium (green circle) and the esophagogastric junction (purple circle); esophageal thirds are represented as colored segments: upper third (red segment), middle third (green segment) and lower third (purple segment).