| 0 |
In situ, intraepithelial, noninvasive
- Acellular mucin or mucinous epithelium may invade into the muscularis propria
- (Adeno) carcinoma, noninvasive, in a polyp or adenoma
- Low-grade appendiceal mucinous neoplasm confined by the muscularis propria (LAMN) (in situ)
- High-grade appendiceal mucinous neoplasm confined by the muscularis propria (HAMN) (in situ) |
| 1 |
Localized only (localized, NOS)
- Confined to appendix, NOS
- Confined to polyp, NOS
- Extension through wall, NOS
- Invasion through muscularis propria
- Lamina propria
- Mucosa (intramucosal, NOS)
- Muscularis mucosae
- Non-peritonealized pericolic tissues invaded
- Perimuscular tissue invaded
- Submucosa
- Subserosa
- Includes acellular mucin or mucinous epithelium that extends into the subserosa (LAMN tumors)
- Transmural, NOS
- Wall, NOS |
| 2 |
Regional by direct extension only
- Abdominal wall
- Adherent to other organs or structures
- Adjacent tissue(s), NOS
- Connective tissue
- Fat, NOS
- Greater omentum
- Mesenteric fat
- Mesentery
- Mesoappendix
- Includes acellular mucin or mucinous epithelium that extends into the mesoappendix
- WITH or WITHOUT involvement of the serosa (LAMN tumors)
- Pericolic fat
- Retroperitoneum
- Serosa (mesothelium) (visceral peritoneum)
- Small intestine
- Tumor found in adhesion(s) if microscopic examination performed |
| 3 |
Regional lymph node(s) involved only
- Tumor deposits (TD) in subserosa or mesentery WITHOUT regional lymph node metastases
- Cecal
+ Anterior (prececal)
+ Posterior (retrocecal)
+ Right colic
- Colic, NOS
- Epicolic (adjacent to bowel wall)
- Ileocolic
- Mesenteric, NOS
- Mesocolic, NOS
- Paracolic/pericolic
- Regional lymph node(s), NOS
+ Lymph node(s), NOS |
| 4 |
Regional by BOTH direct extension AND regional lymph node(s) involved
- Codes (2) + (3) |
| 7 |
Distant site(s)/lymph node(s) involved
- Distant site(s) (including further contiguous extension)
+ Adrenal (suprarenal) gland
+ Bladder
+ Diaphragm
+ Fallopian tube
+ Fistula to skin
+ Gallbladder
+ Intraperitoneal spread/peritoneal metastasis (peritoneal carcinomastosis)
+ WITH or WITHOUT peritoneal mucinous deposits containing tumor cells
+ Includes peritoneal spread with LAMN tumors
+ Kidney
+ Liver
+ Other segment(s) of colon/rectum via serosa
+ Ovary
+ Ureter
+ Uterus
- Distant lymph node(s), NOS
+ Inferior mesenteric
+ Superior mesenteric
- Distant metastasis, NOS
+ Carcinomatosis
+ Distant metastasis WITH or WITHOUT distant lymph node(s) |
| 9 |
Unknown if extension or metastasis |
