Pathologic M

This input is used for staging

Notes

**Note:** The lesser sac of the peritoneum, or omental bursa, is the cavity in the abdomen formed by the lesser and greater omentum; the pancreas forms part of the posterior wall of the lesser sac. **Distant lymph nodes** Pericholedochal (common bile duct) Pyloric Infrapyloric Retropyloric Subpyloric Suprapyloric Porta hepatic nodes Superior mesenteric (see N[regional lymph nodes] for mesenteric, NOS)

NAACCR Item

NAACCR #900
Pathologic M Pathologic M Display Description Registrar Notes
c0 cM0 No distant metastasis Unknown; distant metastasis not stated
Distant metastasis cannot be assessed
Not documented in patient record
c1 cM1 Distant metastasis CLINICAL assessment only:
Distant lymph nodes, NOS

Seeding of peritoneum, even if limited to the lesser sac region
Positive peritoneal cytology

Carcinomatosis

Distant metastasis WITH or WITHOUT distant lymph node(s)

Distant metastasis, NOS

Stated as M1
p1 pM1 Distant metastasis HISTOLOGICALLY confirmed:
Distant lymph nodes, NOS

Seeding of peritoneum, even if limited to the lesser sac region
Positive peritoneal cytology

Carcinomatosis

Distant metastasis WITH or WITHOUT distant lymph node(s)

Distant metastasis, NOS
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 pathologic workup for T and N categories and no pathologic evidence of metastasis
Only Pathologic Stage Group documented (no T, N, or M information available)