Level I- Submandibular and sublingual triangle
Level II- Laterally from skull base upto hyoid bone(bifurcation of common carotid)
Level III-Bifurcation of CC to cricoid cartilage(Omohyoid tendon)
Level IV- Omohyoid tendon to clavicle
Level V- Posterior triangle of neck
Level VI-Anterior compartment(pretracheal)
Level VII-Anterior mediastinum
TNM Staging
N1 – Single node <3cm
N2a-Single ipsilateral node 3-6cm
N2b- Multiple ipsilateral nodes<6cm
N2c-Bilateral/conralateral nodes<6cm
N3-Nodes>6cm
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