Clinical T

This input is used for staging


**Note 1:** Assign 88 for in situ cases (behavior code /2). TNM does not include an in situ category for carcinoid appendix tumors. **Note 2:** Tumor size must be known to assign a value of T1, T2 or T3. You may use a physician’s statement of the T (sub)category if this is the only information in the medical record. * If the tumor appears to be in the T1, T2 or T3 (sub)categories, but no size or (sub)category is specified, assign TX **Note 3:** Assign the appropriate T (sub) category (T1-T3) based on the tumor size for the following descriptions Invasive tumor confined to Lamina propria Mucosa, NOS (including intramucosal, NOS) Muscularis mucosae Muscularis propria Submucosa (superficial invasion) Extension through wall, NOS Invasion through muscularis propria or muscularis, NOS Non-peritonealized pericolic tissues invaded Perimuscular tissue invaded Subserosal tissue/(sub)serosal fat invaded Transmural, NOS Extension to Adjacent tissue(s), NOS Connective tissue Confined to appendix Localized, NOS **Note 4:** Assign T3 or T4 as appropriate for contiguous extension from the site of origin. Discontinuous involvement is assigned in distant metastasis. **Note 5:** Tumor that is adherent to other organs or structures, macroscopically, is classified T4b. However, if no tumor is present in the adhesion, microscopically, the classification should be pT1, pT2 or pT3.


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
Tumor size (TS) unknown for T categories where TS needed to determine T
Physician assigns cTX, no other information available to determine T
c0 cT0 No evidence of primary tumor
c1 cT1 Tumor 2 cm or less in greatest dimension Note: T1 has subcategories of T1a and T1b. Assign T1 only when there is no
information available to assign one of the subcategories

Stated as T1 [NOS]
c1A cT1a Tumor 1 cm or less in greatest dimension Stated as T1a
c1B cT1b Tumor more than 1 cm but not more than 2 cm Stated as T1b
c2 cT2 Tumor more than 2 cm but not more than 4 cm OR
WITH extension to the cecum
Stated as T2
c3 cT3 Tumor more than 4 cm or with extension to the ileum Stated as T3
c4 cT4 Tumor perforates peritoneum or invades other adjacent
organs or structures, e.g.
Abdominal wall
Skeletal muscle
Adherent to other organs or structures clinically with no microscopic examination

Tumor found in adhesion(s) if microscopic examination performed

Adherent to other organs or structures:
Adrenal (suprarenal) gland
Fistula to skin
Greater omentum
Other segment(s) of colon via serosa
Pelvic peritoneum
Retroperitoneum (excluding fat)
Small intestine

Other contiguous extension

Stated as T4
88 88 Not applicable In situ case but no pTis is defined by TNM
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)