Fig. 2From: Natural history of superficial head and neck squamous cell carcinoma under scheduled follow-up endoscopic observation with narrow band imaging: retrospective cohort studyPatient enrollment in this study. Most lesions were treated by endoscopic resection, surgery, chemotherapy, and/or radiation. In the 151 untreated lesions observed, 20 lesions in 17 patients met the eligibility criteria. HNSCC, head and neck squamous cell carcinomaBack to article page