Clinical T
This input is used for staging
Notes
**Note 1:** T1 and T2 categories are based on size and high risk features and not depth of invasion or extension. **Note 2:** T3 category is for head and neck skin primaries only. **Note 3:** Code the tumor with the greatest extension when there are multiple simultaneous tumors. **Note 4:** Skin ulceration does not alter the T category. **Note 5:** Tumor size must be known to assign a value of T1 or T2. 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 or T2 categories, but no size or category is specified, assign TX **Note 6:** Assign the appropriate T category (T1, T2) based on the tumor size for the following descriptions Lesion(s) confined to dermis Subcutaneous tissue (through entire dermis) Underlying cartilage and/or skeletal muscle Confined to skin Localized, NOSNAACCR 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 | Intraepidermal, intraepithelial, noninvasive Bowen disease |
| c1 | cT1 | Tumor 2 cm or less in greatest dimension WITH less than two-high risk features |
Lesion(s) confined to dermis Subcutaneous tissue (through entire dermis) Underlying cartilage and/or skeletal muscle Stated as T1 |
| c2 | cT2 | Tumor more than 2 cm in greatest dimension OR WITH two or more high-risk features |
Stated as T2 |
| c3 | cT3 | Tumor with invasion of deep structures e.g., muscle, bone, cartilage, jaws, and orbit |
For skin of head and neck primaries only: Maxilla Mandible Orbital bone Temporal bone Stated as T3 |
| c4 | cT4 | Tumor with direct or perineural invasion of skull base or axial skeleton | For skin of head and neck primaries only: Direct or perineural invasion of skull base Axial or appendicular skeleton Further contiguous extension Stated as T4 |
| 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) |