Pathologic N
This input is used for staging
Notes
**Note 1:** Histological examination of a regional lymphadenectomy specimen will ordinarily include 3 or more lymph nodes. If the regional lymph nodes are negative, but the number ordinarily examined is not met, classify as pN0. (1) **Note 2:** Code only regional nodes and nodes, NOS, in this field. Distant nodes are coded in M (distant metastasis). **Regional lymph nodes** **Primary tumor in either left or right liver** Hilar Common bile duct Cystic duct Hepatic, NOS: Hepatic artery Hepatic pedicle Hepatoduodenal ligament Portal vein Porta hepatis Periportal Inferior phrenic nodes **Primary tumor in left liver (segments 2-4) or lobe of liver not stated** Gastrohepatic **Primary tumor in right liver (segments 5-8) or lobe of liver not stated** Periduodenal Peripancreatic **Primary tumor involving both lobes of liver** Gastrohepatic Periduodenal PeripancreaticNAACCR Item
NAACCR #890| Pathologic N | Pathologic N Display | Description | Registrar Notes |
|---|---|---|---|
| pX | pNX | Regional lymph node(s) cannot be assessed | Pathologic classification criteria met, evaluation done: Physician unable to assess N Surgical resection primary tumor, no regional lymph nodes removed Involvement of regional lymph nodes not documented Physician assigns pNX, no other information available to determine N |
| p0 | pN0 | No regional lymph node metastasis | |
| p1 | pN1 | Regional lymph node metastasis | Regional lymph nodes, NOS Lymph nodes, NOS Stated as N1 |
| c0 | cN0 | Clinically: No regional lymph node metastasis | Use only for TNM defined pTis cases where there is a resection of the primary and the nodes are not evaluated pathologically |
| 88 | 88 | Not applicable | Primary site/histology not TNM defined Death certificate only (DCO) case |
| <BLANK> | BLANK | See Registrar Notes | Pathologic classification criteria not met No surgical resection of primary tumor and there isn’t a positive biopsy of a structure in the highest T category and highest N category Evidence of metastatic disease (pM1), no other workup Only Pathologic Stage Group documented (no T, N, or M information available) |