Second primary cancer of the esophagus is frequent in head and neck patients, especially in high-risk populations, and has a great impact on the prognosis. Although Positron emission tomography (PET)/computed tomography (CT) scan is commonly conducted in head and neck patients, its ability to detect early esophageal cancer is limited. | Superiority of NBI endoscopy to PET CT scan in detecting esophageal cancer among head and neck cancer patients A retrospective cohort analysis
