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Table 2 Regional lymph node staging

From: Neck dissections: radical to conservative

Nx

Regional lymph nodes cannot be assessed

N0

No regional lymph node metastasis

N1

Metastasis in a single ipsilateral lymph node, 3 cm or less in greatest dimension

N2a

Metastasis in a single ipsilateral lymph node, more than 3 cm but less than 6 cm in greatest dimension

N2b

Metastasis in a multiple ipsilateral lymph nodes, none more than 6 cm in greatest dimension

N2c

Metastasis in bilateral or contralateral lymph nodes, none more than 6 cm in greatest dimension

N3

Metastasis in a lymph node more than 6 cm in greatest dimension (Midline nodes are considered ipsilateral nodes)

  1. (Adapted from UICC / AJCC TNM Classification of Malignant Tumors, 6th edition, 2002)