Clinical T

This input is used for staging

Notes

**Note 1:** Tumor size must be known to assign a value of T1, T2 or T3. You may use a physician’s statement of the T category if this is the only information in the medical record. * If the tumor appears to be in the T1, T2 or T3 categories, but no size or category is specified, assign TX **Note 2:** Assign the appropriate T category (T1, T2, T3) based on the tumor size for the following descriptions Invasive tumor confined to one of the following subsites Anterior wall including vallecula One lateral wall (including tonsillar pillar/fossa, palatine tonsil and tonsil, NOS) Posterior wall Base of tongue (including lingual tonsil) Buccal mucosa Floor of mouth Gum (gingiva) Involvement of both lateral walls through soft palate or base of tongue Soft palate Inferior surface including uvula Soft palate, NOS Superior (nasopharyngeal) surface Confined to oropharynx, NOS Localized, NOS **Note 3:** Mucosal extension to lingual surface of epiglottis from primary tumors of the base of the tongue and vallecular does not constitute invasion of the larynx.

NAACCR Item

NAACCR #940
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
pIS pTis Carcinoma in situ Intraepithelial, noninvasive

Stated as Tis
c1 cT1 Tumor 2 cm or less in greatest dimension Stated as T1
c2 cT2 Tumor more than 2 cm but not more than 4 cm in greatest dimension Stated as T2
c3 cT3 Tumor more than 4 cm in greatest dimension OR
extension to lingual surface of epiglottis
Epiglottis, lingual surface, plus both lateral walls through soft palate or base of tongue

Epiglottis WITH fixation

Stated as T3
c4 cT4 Not defined by UICC*# Note: T4 has subcategories of T4a and T4b. Assign T4 only when there is no information available to assign one of the subcategories

Tumor invades bone, nerve or extrinsic deep muscles

Stated as T4[NOS]
c4A cT4a Tumor invades any of the following:
Larynx
Deep/extrinsic muscle of tongue, which are:
Genioglossus
Hyoglossus
Palatoglossus
Styloglossus
Medial pterygoid
Hard palate
Mandible
Hypopharynx NOS
Posterior surface of epiglottis
Pterygoid muscle, NOS
Pyriform sinus
Soft tissue of neck

Stated as T4a
c4B cT4b Tumor invades any of the following:
Lateral pterygoid muscle
Pterygoid plates
Lateral nasopharynx
Skull base
Encases carotid artery
Prevertebral fascia/muscle

Base of skull
Bone of skull
Bone, NOS

Further contiguous extension:
Anterior 2/3 of tongue
Parotid gland

Stated as T4b
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)
\* T4 [NOS] is not defined by UICC in the 7th edition. Approval has been provided by UICC to use "Tumor invades bone, nerve or extrinsic deep muscles" as T4 [NOS]. \# T4 [NOS] is not defined in AJCC 7th edition.