Clinical T

This input is used for staging

Notes

**Note 1:** Assign 88 for in situ cases (behavior code /2). TNM does not include an in situ category for mucosal melanoma tumors. **Note 2:** Mucosal melanomas are aggressive tumors, therefore, T1 and T2 are omitted, as are Stages I and II. **Note 3:** Assign T3 for localized tumor when no other information is available or for extension involving the mucosa only of adjacent sites. **Note 4:** Assign T4a or T4b for extension involving the deeper tissues of the primary or adjacent sites.

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
Physician assigns cTX, no other information available to determine T
c0 cT0 No evidence of primary tumor#
c3 cT3 Tumor limited to the epithelium and/or submucosa (mucosal disease) Tumor confined to mucosa of left, right or both ethmoid sinus(es)

Confined to mucosa of ethmoid sinus, NOS

Extension involving mucosa only of nasal cavity including:
Floor
Lateral wall
Nasal vestibule
Nasal cavity, NOS
Septum
Turbinates

Extension to mucosa only of adjacent structures:
Frontal sinus
Maxillary sinus
Nasopharynx
Sphenoid sinus

Localized, NOS

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:
Deep soft tissue
Cartilage
Bone
Overlying skin
Extension to deep soft tissue of left, right, or both ethmoid sinus(es)
Soft tissue NOS
Extension to deep soft tissue of left or right ethmoid sinus or ethmoid sinus, NOS with mucosal involvement of structures in T3
Invasive tumor confined to either left, right, or both ethmoid sinus(es) with bony invasion
(Involvement of perpendicular plate of ethmoid bone or ethmoid air cells)

Extension to deep tissues of adjacent structures with or without bony invasion:
Anterior orbital contents
Frontal sinus
Hard palate
Maxillary sinus
Medial wall or floor of orbit
Nasopharynx
Orbital plate
Pterygoid plates
Skin of cheek
Skin of nose
Sphenoid sinus

Stated as T4a
c4B cT4b Tumor invades any of the following:
Brain
Dura
Skull base
Lower cranial nerves (IX, X, XI, XII)
Masticator space
Carotid artery
Prevertebral space
Mediastinal structures
Anterior cranial fossa
Base of skull
Clivus
Cribriform plate
Middle cranial fossa

Further contiguous extension :
Carotid artery (encased)

Stated as T4b
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)
\* 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]. \# TX, T0 and T4 [NOS] are not defined in AJCC 7th edition.