Pathologic T
This input is used in derivation
Notes
**Note 1:** Assign 88 for in situ cases (behavior code /2). TNM does not include an in situ category for thyroid tumors. **Note 2:** Per TNM, anaplastic carcinomas are assigned T4. **Note 3:** 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 4:** Assign the appropriate T category (T1, T2 or T3) based on the tumor size for the following descriptions: Single invasive tumor confined to thyroid Extension into thyroid capsule, but not beyond Multiple foci confined to thyroid Confined to thyroid, NOS Localized, NOS **Note 5:** Multifocal tumors of all histological types should be designated (m) (the largest determines the classification), e.g, T2. * Record the information regarding solitary vs. multifocal tumors in **Site-Specific Factor 1**.NAACCR Item
NAACCR #880| Pathologic T | Pathologic T Display | Description | Registrar Notes |
|---|---|---|---|
| pX | pTX | Primary tumor cannot be assessed | Note: Anaplastic tumors: Do not assign TX. See T4 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 Confined to thyroid, histology not anaplastic, and size not known |
| p0 | pT0 | No evidence of primary tumor | |
| p1 | pT1 | Tumor 2 cm or less in greatest dimension, LIMITED to the thyroid |
Note 1: T1 has subcategories of T1a and T1b. Assign T1 only when there is no information available to assign one of the subcategories Note 2: T1 is not applicable for anaplastic tumors. Stated as T1[NOS] |
| p1A | pT1a | Tumor 1 cm or less in greatest dimension, LIMITED to the thyroid |
Stated as T1a Note: T1a is not applicable for anaplastic tumors. |
| p1B | pT1b | Tumor more than 1 cm but not more than 2 cm in greatest dimension, LIMITED to the thyroid |
Stated as T1b Note: T1b is not applicable for anaplastic tumors. |
| p2 | pT2 | Tumor more than 2 cm but not more than 4 cm in greatest dimension, LIMITED to the thyroid |
Stated as T2 Note: T2 is not applicable for anaplastic tumors. |
| p3 | pT3 | Tumor more than 4 cm in greatest dimension Limited to the thyroid Any tumor with minimal extrathyroid extension (e.g., extension to sternothyroid muscle or perithyroid soft tissues) |
Stated as T3 Note: T3 is not applicable for anaplastic tumors. Minimal extrathyroid extension including: Strap muscle(s): Omohyoid Sternohyoid Sternothyroid Thyrohyoid Pericapsular soft tissue/connective tissue |
| p4 | pT4 | Not defined by UICC* | Note 1: T4 has subcategories of T4a and T4b. Assign T4 only when there is no information available to assign one of the subcategories Note 2: Anaplastic tumors: Assign T4, or one of its subcategories. Assign T4 [NOS] if no information available to assign T4a or T4b. Tumor invades, bone, nerve or extrinsic deep muscles Stated as T4[NOS] |
| p4A | pT4a | Tumor extends beyond the thyroid capsule and invades any of the following: Subcutaneous soft tissues Larynx Trachea Esophagus Recurrent laryngeal nerve (anaplastic carcinoma only) Tumor (any size) limited to the thyroid |
Cricoid cartilage Esophagus Larynx Nerves: Recurrent laryngeal Vagus Parathyroid Sternocleidomastoid muscle Trachea Stated as T4a |
| p4B | pT4b | Tumor invades: Prevertebral fascia Mediastinal vessels Or encases carotid artery (anaplastic carcinoma only) Tumor (any size) extends beyond the thyroid capsules |
Bone Blood vessel(s) (major): Carotid artery (encased) Jugular vein Thyroid artery or vein Skeletal muscle, other than strap or sternocleidomastoid muscle Thyroid cartilage Tumor described as ""FIXED to adjacent tissues"" Further contiguous extension including: Mediastinal tissues Prevertebral fascia Stated as T4b |
| 88 | 88 | Not applicable | Primary site/histology not TNM defined In situ case but no pTis is defined by TNM |
| <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) |