Nasopharyngeal Cancer pN3b TNM Finding v7

**Semantic type:** Finding

**Definition:** Nasopharyngeal cancer with extension to the supraclavicular fossa. Supraclavicular zone or fossa is relevant to the staging of nasopharyngeal carcinoma and is the triangular region originally described by Ho. It is defined by three points: (1) the superior margin of the sternal end of the clavicle, (2) the superior margin of the lateral end of the clavicle, (3) the point where the neck meets the shoulder. This would include caudal portions of levels IV and VB. All cases with lymph nodes (whole or part) in the fossa are considered N3b. (from AJCC 7th Ed.)