Table 3.

O’Brien classification system of intraparotid and neck nodal metastases

Parotid
P0	No clinical disease in the parotid
P1	Metastatic node up to 3 cm diameter
P2	Metastatic node more than 3 cm up to 6 cm diameter or multiple parotid nodes
P3	Metastatic node more than 6 cm in diameter or disease involving VII nerve or skull base
Neck
N0	No clinical disease in the neck
N1	Single ipsilateral neck node up to 3 cm diameter
N2	Single node more than 3 cm diameter or multiple neck nodes or contralateral nodes