Pathologic N
This input is used for staging
Notes
**Note 1:** Histological examination of a regional lymphadenectomy specimen will ordinarily include 10 or more lymph nodes. If the lymph nodes are negative, but the number ordinarily 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** Anterior to the ampulla of Vater Inferior to the ampulla of Vater Posterior to the ampulla of Vater Superior to the ampulla of Vater Celiac Hepatic Hepatic artery Infrapyloric (subpyloric) Lateral aortic (lumbar) Node of the foramen of Winslow (epiploic) (omental) Pancreaticoduodenal Peripancreatic (EXCEPT nodes at tail of pancreas) Periportal (portal vein) Proximal mesenteric Retroperitoneal Superior mesentericNAACCR Item
NAACCR #890| Pathologic N | Pathologic N Display | Description | Registrar Notes |
|---|---|---|---|
| pX | pNX | Regional lymph nodes 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) |