Pathologic N
This input is used for staging
Notes
**Note 1:** Histological examination of a regional lymphadenectomy specimen will ordinarily include 12 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:** One or more malignant satellite peritumoral nodules or tumor deposits (TD) in the periappendiceal adipose tissue of a primary carcinoma without histologic evidence of residual lymph node in the nodule may represent discontinuous spread, venous invasion with extravascular spread, or a totally replaced lymph node. Replaced nodes are counted as positive nodes and coded in Regional Lymph Nodes. TD representing discontinuous spread or venous invasion are coded in T, and the number of TD representing discontinuous spread or venous invasion is coded in **Site-Specific Factor 4**. **Regional lymph nodes for appendix** Celiac Anterior (prececal) Ileocolic Posterior (retrocecal) Right colic Colic, NOS Epicolic (adjacent to bowel wall) Mesenteric, NOS Mesocolic, NOS Paracolic/pericolic 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 1-3 regional lymph nodes | Stated as N1 |
| p2 | pN2 | Metastasis in 4 or more regional 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) |