This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Surgery
Patient with head and neck cancer with contralateral Lymphnode of 3 cm size. Nstaging 
Select and explain. 
A. N2a, B. N2b, C. N2c, D. N3
C: N2c
Answer: C: N2c 
Explanation: N0
No nodal metastasis
 
 


N1
Single
Ipsilateral
Equal to or <3 cm


N2a
Single
Ipsilateral
3 to 6 cm


N2b
Multiple
Ipsilateral
None > 6 cm


N2c
Single or Multiple
Bilateral or Contralateral
None > 6 cm


N3
Single or Multiple
Ipsilateral, Bilateral or Contralateral
Any node >6 cm