Clinical T
This input is used for staging
Notes
**Note 1:** Periosteum is a fibrous membrane that wraps the outer surface of bones. Cortical bone is the dense compact outer layer of the bone. Trabecular, cancellous, or spongy bone (spongiosa) is a porous network of tissue filling the interior of bone, decreasing weight and allowing room for blood vessels and marrow. **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 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 3:** For the following descriptions, assign the appropriate T category (T1, T2 or T3) based on the tumor size when involvement is limited to the cortical bone. Invasive tumor on one side confined to Lamina propria Submucosa Midline tumor Tumor crosses midline Base of tongue Bone, NOS Cortical bone of mandible Cortical bone of maxilla Cortical bone, NOS Floor of mouth Gingiva, lower Mandible, NOS Maxilla, NOS Retromolar trigone Sublingual gland Confined to anterior tongue Localized, NOS **Note 4:** Involvement through cortical bone is required for assignment of T4a.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 | 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 | 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 | (lip) Tumor invades through: Cortical bone Floor of mouth Inferior alveolar nerve Skin (chin or nose) (oral cavity) Tumor invades through: Cortical bone Into deep/extrinsic muscle of tongue: Genioglossus Hyoglossus Palatoglossus Styloglossus Maxillary sinus Skin of face |
Lateral pharyngeal wall Soft palate, inferior surface Tonsillar pillars and fossae Tonsils Trabecular bone of mandible Trabecular bone of maxilla Deep (extrinsic) muscle of tongue: Geniohyoid Mylohyoid Stated as T4a |
| c4B | cT4b | (lip and oral cavity) Tumor invades: Masticator space Pterygoid plates Skull base or Encases internal carotid artery |
Specified bone Further contiguous extension 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) |