Simplified Nodal Classification
Level 1: Submandibular, submental.
Level 2: Internal jugular from skull base to carotid bifurcation.
Level 3: Internal jugular below carotid bifurcation to omohyoid.
Level 4: Internal jugular below omohyoid.
Level 5: Posterior triangle.
Level 6: Adjacent to thyroid.
Level 7: Tracheal esophageal groove and superior mediastinum.