Chapter 084. Head and Neck Cancer (Part 3)

Table 84-1 TNM Classification for Head and Neck Cancer (Except Nasopharyngeal) Primary Tumor Site T Grade Oropharynx Hypopharynx T1 0–2 cm 0–2 cm T2 2.1–4 cm 1 site, 2–4 cm T3 4 cm 4 cm T4a Larynx, muscle of tongue, Thyroid/cricoid cartilage, medial pterygoid, hard palate, hyoid mandible invasion bone, thyroid or gland, central esophagus, compartment soft tissue invasion T4b Lateral pterygoid muscle, pterygoid plates, Invasion of prevertebral lateral fascia, encases carotid artery, or nasopharynx, or skull base or involves mediastinal structures encases carotid artery invasion Regional Lymph Nodes (N) NX Regional lymph nodes cannot be assessed N0 No regional lymph node metastasis N1 Unilateral metastasis in lymph node(s), ≤6 cm in greatest dimension, above the supraclavicular fossa N2 ...