TNM
DEFINITIONS (continued)
N - Nodal
Involvement
N0
|
No demonstrable metastasis
to regional lymph nodes. |
N1
|
Metastasis to lymph nodes in the peribronchial
or the ipsilateral hilar region, or both,
including direct extension. |
N2
|
Metastasis to ipsilateral mediastinal
lymph nodes and subcarinal lymph nodes. |
N3
|
Metastasis to contralateral mediastinal
lymph nodes, contralateral hilar lymph
nodes, ipsilateral or contralateral scalene
or supraclavicular lymph nodes. |
M - Distant Metastasis
M0
|
No (known) distant metastasis |
M1
|
Distant metastasis present***. Specify
site(s) |
Footnotes:
*T1: The uncommon superficial tumor of any size with its invasive component
limited to the bronchial wall which may extend proximal to the main bronchus
is classified
as T1. **T4: Most pleural effusions associated
with lung cancer are due to tumor. There
are, however, some few patients in whom cytopathological
examination
of pleural
fluid (on more than one specimen) is negative for tumor, the fluid is non-bloody
and is not an exudate. In such cases where these elements and clinical
judgment dictate that the effusion is not
related to the tumor, the patients should
be staged T1, T2 or T3, excluding effusion as a staging element.
***M1: Separate metastatic tumor nodules in the
ipsilateral nonprimary tumor lobe(s) of
the lung also are classified M1.
|
