Clinical T

This input is used for staging


**Note 1:** High grade dysplasia and severe dysplasia of the small intestine are generally n ot reportable in cancer registries. * Assign pTis if your registry collects these tumors **Note 2:** The nonperitonealized perimuscular tissue is, for jejunum and ileum, part of the mesentery and, for duodenum in areas where serosa is lacking, part of the interface with the pancreas. **Note 3:** Code depth of invasion in preference to intraluminal spread or lateral extension to adjacent segment(s) of small intestine or cecum.


Clinical T Clinical T Display Description Registrar Notes
cX cTX Primary tumor cannot be assessed Clinical classification criteria met, evaluation done:
Physician unable to assess T
Extension cannot be determined
Physician assigns cTX, no other information available to determine T
c0 cT0 No evidence of primary tumor
pIS pTis Carcinoma in situ Noninvasive

(Adeno)carcinoma, noninvasive, in a polyp

Stated as Tis
c1 cT1 Tumor invades lamina propria, muscularis mucosae or submucosa# Note: T1 has subcategories of T1a and T1b. Assign T1 only when there is no information available to assign one of the subcategories

Intraluminal spread to other segments of small intestine or cecum

Localized, NOS

Stated as T1 [NOS]
c1A cT1a Tumor invades lamina propria or muscularis mucosae Invasive tumor confined:
Head of polyp
Stalk of polyp
Mucosa, NOS
Intramucosal, NOS
Polyp, NOS

Stated as T1a
c1B cT1b Tumor invades submucosa Superficial invasion of submucosa

Stated as T1b
c2 cT2 Tumor invades muscularis propria Stated as T2
c3 cT3 Tumor invades subserosa or non-peritonealized perimuscular tissue (mesentery or retroperitoneum)
WITH extension 2 cm or less
Invasion through muscularis propria or muscularis, NOS
Extension through wall, NOS
Subserosal tissue/(sub)serosal fat invaded
Transmural, NOS
Wall, NOS

Adjacent connective tissue
Adjacent tissue(s), NOS
Nonperitonealized perimuscular tissue (mesentery, mesenteric fact, retroperitoneum): depth of invasion less than 2 cm OR not specified

Fat, NOS

Stated as T3
c4 cT4 Tumor perforates visceral peritoneum or directly invades other organs or structures, including:
Abdominal wall by way of serosa
Mesentery or retroperitoneum more than 2 cm
Other loops of small intestine

For duodenum only, invasion of pancreas
Invasion of/through serosa (mesothelium) (tunica serosa) (visceral peritoneum)

All small intestine sites:
Nonperitonealized perimuscular tissue (mesentery, mesenteric fact, retroperitoneum): depth of invasion greater than 2 cm
Other segments of the small intestine via serosa

Duodenum primary only (C170):
Ampulla of Vater
Blood vessel(s), major:
Gastroduodenal artery
Portal vein
Renal vein
Superior mesenteric artery or vein
Vena cava
Extrahepatic bile duct(s)
Hepatic flexure
Kidney (right or NOS)
Liver (quadrate lobe, right lobe or NOS)
Pancreatic duct
Transverse colon
Ureter, right

Jejunum or ileum primary only (C171, C172):
Colon, including appendix
Fallopian tube(s)

Further contiguous extension

Stated as T4
88 88 Not applicable Primary site/histology not TNM defined
Death certificate only (DCO) case
<BLANK> BLANK See Registrar Notes Clinical classification criteria not met
Clinical classification criteria met, evaluation done:
No information about diagnostic workup
Results not documented in record
Clinical evaluation of primary tumor not done or unknown if done
Tumor first detected on surgical resection (no clinical workup)
Evidence of metastatic disease [(cM1) or (pM1)], no other workup
Only Clinical Stage Group documented (no T, N, or M information available)
\# T1 [NOS] is not defined in AJCC 7th edition