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Table 2 Definitions of TNM staging factors for primary ACCs of the trachea

From: Primary adenoid cystic carcinoma of the trachea: clinical outcome of 38 patients after interdisciplinary treatment in a single institution

Stages

Definitions

T-Stage

 T1

Primary tumor confined to trachea; size < 2 cm

 T2

Primary tumor confined to trachea; size > 2 cm

 T3

Spread outside the trachea but not to adjacent organs or structures

 T4

Spread to adjacent organs or structures

 Tx

Unkown or cannot be assessed

N-Stage

 N0

No evidence of regional nodal disease

 N1

Clinical or histological evidence of regional nodal disease

 Nx

Unknown or cannot be assessed

M-Stage

 M0

No evidence of distant metastases

 M1

Clinical or histological evidence of distant metastases

 Mx

Unknown or cannot be assessed

Pn-Stage

 Pn0

No histological evidence of perineural invasion

 Pn1

Histological evidence of perineural invasion

 Pnx

Unkown or cannot be assessed