Template:Radiation Oncology/Head & Neck/Node staging-8thEd

Clinical (cN)

• NX - Cannot be assessed
• N0 - No regional lymph nodes metastasis
• N1 - Single ipsilateral lymph node, <= 3 cm in greatest dimension, and ENE(-)
• N2
  • N2a - Single ipsilateral lymph node, 3-6 cm in greatest dimension, and ENE(-)
  • N2b - Multiple ipsilateral lymph nodes, <= 6 cm in greatest dimension, and ENE(-)
  • N2c - Bilateral or contralateral lymph nodes, <= 6cm in greatest dimension, and ENE(-)
• N3
  • N3a - Lymph node > 6 cm, and ENE(-)
  • N3b - Clinically overt ENE(+) (ENE_c)
    (defined as invasion of skin, infiltration of muscle, dense tethering or fixation to adjacent structures, cranial nerve, brachial plexus, sympathetic trunk, or phrenic nerve invasion with dysfunction)

Pathological (pN)

• NX - Cannot be assessed
• N0 - No regional lymph nodes metastasis
• N1 - Single ipsilateral lymph node, <= 3cm in greatest dimension, and ENE(-)
• N2
  • N2a - Single node (ipsi or contralateral), <= 3cm, and ENE(+); or single ipsilateral node, 3-6 cm, and ENE(-)
  • N2b - Multiple ipsilateral nodes, <= 6 cm, and ENE(-)
  • N2c - Bilateral or contralateral nodes, <= 6 cm, and ENE(-)
• N3
  • N3a - Lymph node > 6 cm, and ENE(-)
  • N3b - Single ipsilateral node, > 3 cm, and ECE(+); or multiple LNs and any with ENE(+)