Gastroenterology Research and Practice / 2013 / Article / Fig 2

Clinical Study

Chromoendoscopy to Detect Early Synchronous Second Primary Esophageal Carcinoma in Patients with Squamous Cell Carcinomas of the Head and Neck?

Figure 2

Tumor staging of head and neck cancer according to TNM classification. Stage I: T1N0M0; stage II: T2N0M0; stage III: T3N0M0; stage IV: T4N0-3M0.