Pathologic N
This input is used in derivation
Notes
**Note 1:** Histological examination of a regional lymphadenectomy specimen will ordinarily include 16 or more lymph nodes. If the 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:** Assign N1 if regional lymph nodes are involved but there is no indication of the number of nodes involved. **Note 4:** Assign as regional node metastases when there are metastatic nodules in the fat adjacent to a gastric carcinoma WITHOUT evidence of residual lymph node tissue; assign as M (distant metastases) for nodules implanted on peritoneal surfaces. **Regional lymph nodes for Stomach are:** Celiac: Hepatic Hepatoduodenal (for lesser curvature) Left gastric (superior gastric), NOS: Cardial Cardioesophageal Gastric, left Gastropancreatic, left Lesser curvature Lesser omental Paracardial Nodule(s) in perigastric fat Pancreaticosplenic (pancreaticolienal) Pancreaticoduodenal Perigastric, NOS Peripancreatic Right gastric (inferior gastric), NOS: Gastrocolic Gastroduodenal Gastroepiploic (gastro-omental), right or NOS Gastrohepatic Greater curvature Greater omental Pyloric, NOS: infrapyloric, subpyloric, suprapyloric Splenic (lienal), NOS: Gastroepiploic (gastro-omental), left Splenic hilar Regional lymph nodes, NOS Lymph nodes, NOSNAACCR 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 | Metastasis in 1-2 regional lymph nodes | Regional lymph nodes, NOS Lymph nodes, NOS Stated as N1 |
| p2 | pN2 | Metastasis in 3-6 regional lymph nodes | Stated as N2 |
| p3 | pN3 | Metastasis in 7 or more regional lymph nodes | Note: N3 has subcategories of N3a and N3b. Assign N3 only when there is no information available to assign one of the subcategories Stated as N3 [NOS] |
| p3A | pN3a | Metastasis in 7-15 regional lymph nodes | Stated as N3a |
| p3B | pN3b | Metastasis in 16 or more regional lymph nodes | Stated as N3b |
| 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 |
| <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) |