Collaborative Stage

Note 1: Code only regional nodes and nodes, NOS, in this field. Distant nodes are coded in the field Mets at DX. The regional nodes are inguinal or femoral: inguinal, NOS; deep inguinal, NOS; Node of Cloquet or Rosenmuller (highest deep inguinal); and superficial inguinal (femoral) and regional lymph nodes [NOS].
Note 2: In-transit metastasis is defined as a tumor distinct from the primary lesion and located either between the primary lesion and the draining regional lymph nodes or distal to the primary lesion. In-transit metastasis is coded in the CS Lymph Nodes field.
Note 3: According to AJCC, "there is no lower threshold of tumor burden defining the presence of regional nodal metastasis. Specifically, nodal tumor deposits less than 0.2 mm in diameter (previously used as the threshold for defining nodal metastasis), are included in the staging of nodal disease as a result of the consensus that smaller volumes of metastatic tumor are still clinically significant". This means that any finding of Merkel cell carcinoma in lymph nodes, regardless of size and including isolated tumor cells (ITCs), should be coded positive lymph nodes in this field.

^ For codes 105, 600, and 800 ONLY, the N category for AJCC 7th Edition is assigned based on the value of Site-Specific Factor 3, Clinical Status of Lymph Node Mets, as shown in the CS Lymph Nodes and Clinical Status table.
* CS Lymph node codes 105, 520, and 540 are used in conjunction with CS Site Specific Factor 11 (Regional Lymph Node - Laterality) to determine the N code for AJCC 6th edition - see CS AJCC 6th CS Lymph Nodes and SSF 11 Table.

Code	Description	TNM 7 Map	TNM 6 Map	SS77 Map	SS2000 Map
000	No regional lymph node involvement	N0	N0	NONE	NONE
100	OBSOLETE DATA RETAINED V0200 Unilateral regional lymph nodes: Inguinal, NOS: Deep inguinal, NOS: Node of Cloquet or Rosenmuller (highest deep inguinal) Superficial inguinal (femoral) Regional lymph nodes, NOS (unilateral) FIGO Stage III	ERROR	N1	RN	RN
105	Unilateral or bilateral regional lymph nodes: Inguinal, NOS: Deep inguinal, NOS: Node of Cloquet or Rosenmuller (highest deep inguinal) Superficial inguinal (femoral) Regional lymph nodes, NOS	^	*	RN	RN
110	Stated as N1a with no other information on regional lymph nodes	N1a	N1	RN	RN
120	Stated as N1b with no other information on regional lymph nodes	N1b	N1	RN	RN
130	Stated as N1 [NOS] with no other information on regional lymph nodes	N1NOS	N1	RN	RN
500	OBSOLETE DATA RETAINED V0200 Bilateral or contralateral regional lymph nodes: Inguinal, NOS: Deep inguinal, NOS: Node of Cloquet or Rosenmuller (highest deep inguinal) Superficial inguinal (femoral) Regional lymph nodes, NOS (bilateral/contralateral) FIGO Stage IVA	ERROR	N2	RN	RN
520	In-transit metastasis WITHOUT regional lymph node involvement or involvement of regional lymph nodes not stated (see Note 2)	N2	*	RN	RN
540	In-transit metastasis WITH regional lymph nodes listed in code 105 (see Note 2)	N2	*	RN	RN
600	Regional lymph node(s), NOS	^	N1	RN	RN
800	Lymph nodes, NOS	^	N1	RN	RN
999	Unknown; not stated Regional lymph node(s) cannot be assessed Not documented in patient record	NX	NX	U	U

MerkelCellVulva

CS Lymph Nodes