Pathologic 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.


Pathologic T Pathologic T Display Description Registrar Notes
pX pTX Primary tumor cannot be assessed Pathologic classification criteria met, evaluation done:
Physician unable to assess T
Surgical resection of primary tumor, extension not stated
Tumor size (TS) unknown for T categories where TS needed to determine T
Physician assigns pTX, no other information available to determine T
p0 pT0 No evidence of primary tumor
p1 pT1 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]
p1A pT1a Tumor 1 cm or less in greatest dimension Stated as T1a
p1B pT1b Tumor more than 1 cm but not more than 2 cm Stated as T1b
p2 pT2 Tumor more than 2 cm but not more than 4 cm OR
WITH extension to the cecum
Stated as T2
p3 pT3 Tumor more than 4 cm or with extension to the ileum Stated as T3
p4 pT4 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 Pathologic classification criteria not met
Pathologic classification criteria met, evaluation done:
Results not documented in patient record
No surgical resection of known primary tumor (not T0)
Resection insufficient for site-specific pathologic assessment
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)