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Table 1 O’Brien et al. system for clinical staging of metastatic cutaneous SCC involving the parotid gland

From: Prognostic factors for metastatic cutaneous squamous cell carcinoma of the parotid

O’Brien et al. system for clinical staging of metastatic cutaneous SCC involving the parotid gland[8]
Parotid  
P1 Metastatic node ≤ 3 cm
P2 Metastatic node > 3 cm but ≤ 6 cm or
Multiple parotid nodes
P3 Metastatic node > 6 cm or
Disease involving facial nerve or skull base
Neck  
N0 No clinical neck disease
N1 Single ipsilateral neck node ≤ 3 cm
N2 Single node > 3 cm or
  Multiple nodes or Contralateral neck nodes