Investigation and Observation of the Pharynx to the Cervical Esophagus Using Trans-nasal Endoscopy with Image-enhanced Endoscopy for Early Detection of Head and Neck Cancers

Introduction: We started endoscopic treatment for superficial pharyngeal cancer in 1996, and thus far, 97 lesionsof 77 cases of superficial head and neck cancer have been detected using trans-oral endoscopy. However, some areas are difficult to observe with trans-oral endoscopy

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