Pathologic N
This input is used for staging
Notes
**Note 1:** Histological examination of a regional lymphadenectomy specimen will ordinarily include 3 or more regional 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). **Note 3:** Periaortic, pericaval, superior mesenteric artery, and celiac artery lymph nodes are coded to N2.NAACCR 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 (including nodes along the cystic duct, common bile duct, common hepatic artery, and portal vein) | Regional lymph nodes: Cystic duct (Calot's node) Node of foramen of Winslow (omental) (epiploic) Pancreaticoduodenal Pericholedochal (common bile duct) Periduodenal Peripancreatic (near head of pancreas only) Porta hepatis (portal)(periportal) (hilar) (in hilus of liver) Regional lymph nodes, NOS Lymph nodes, NOS Stated as N1 |
| p2 | pN2 | Not defined by UICC* | Metastasis to periaortic, pericaval, superior mesenteric artery, and/or celiac artery lymph nodes Stated as N2 |
| 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) |