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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