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(+) (ENEc) (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(+)