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- NX Nodes cannot be measured
- N0 No involved lymph nodes
- N1 Single involved node, same side, less than 1 1/4 in.(3cm)
- N2 Single involved node, same side,
- N2a one node, 1 1/4-2 1/2 in.(3-6cm)
- N2b multiple nodes, none over 2 1/2 in.(6cm)
- N3 Massive involved lymph nodes
- N3a a node over 2 1/2in.(6cm) on same side
- N3b nodes on both sides
- N3c nodes only on opposite side