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 NET colon tumors. **Note 2:** Ignore intraluminal extension to adjacent segment(s) of colon/rectum or to the ileum from the cecum; code depth of invasion or extracolonic spread as indicated. **Note 3:** Tumor size must be known to assign a value of T1 or T2. 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 or T2 (sub)categories, but no size or category is specified, assign TX **Note 4:** Assign the appropriate T (sub)category (T1, T2) based on the tumor size for the following descriptions: Invasive tumor confined to mucosa, NOS including intramucosal, NOS Invades lamina propria, including lamina propria in the stalk of a polyp Invades submucosa (superficial invasion), including submucosa in the stalk of a polyp Confined to and not through the muscularis mucosae, including muscularis mucosae in the stalk of a polyp Confined to colon, NOS Localized, NOS **Note 5:** Assign T4 for tumor with macroscopic adhesions to other organs or structures and for pathologically confirmed tumor in adhesions. * If no tumor is present in adhesions upon microscopic examination, assign the appropriate T category to describe the microscopically confirmed depth of tumor invasion for these cases


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 invades lamina propria or submucosa and is
no greater than 2 cm in size
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 less than 1 cm in size Stated as T1a
p1B pT1b Tumor 1-2 cm in size Stated as T1b
p2 pT2 Tumor invades muscularis propria or is greater than
2 cm in size
Muscularis propria invaded

Stated as T2
p3 pT3 Tumor invades subserosa, or non-peritonealized
pericolic or perirectal tissues
Extension through wall, NOS
Through muscularis propria or muscularis, NOS
Perimuscular tissue invaded
Subserosal tissue/(sub)serosal fat invaded
Transmural, NOS

Extension to:
All colon sites:
Adjacent tissue(s), NOS
Connective tissue
Mesenteric fat
Pericolic fat

Ascending and descending colon:
Retroperitoneal fat

Transverse colon/flexures:
Gastrocolic ligament
Greater omentum

Fat, NOS

Stated as T3
p4 pT4 Tumor perforates peritoneum or invades other organs Invasion of/through serosa (mesothelium) (visceral peritoneum)

Adherent to other organs or structures, NOS
All colon sites:
Abdominal wall
Adrenal (suprarenal) gland
Fistula to skin
Other segment(s) of colon via serosa
Small intestine
Retroperitoneum (excluding fat)

Cecum (C180):
Fallopian tube
Greater omentum

Ascending colon (C182):
Greater omentum
Liver, right lobe
Right kidney
Right ureter

Transverse colon and flexures (C183, C184, C185):
Gallbladder/bile ducts

Descending colon (C186):
Fallopian tube
Greater omentum
Left kidney
Left ureter
Pelvic wall

Sigmoid colon (C187):
Cul de sac (rectouterine pouch)
Fallopian tube
Greater omentum
Pelvic wall

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)