## CS Extension

This input is used for staging

### Notes

**Note 1**: AJCC considers all anaplastic carcinomas to be T4. **Note 2**: AJCC considers "in situ carcinoma of thyroid gland" an impossible diagnosis. Any case so coded is mapped to TX for AJCC stage and in situ Summary Stage. **Note 3**: The assignment of T1 and T2 categories for carcinoma of the thyroid is based on tumor size. A physician's statement of the T category may be used to code both CS Tumor Size and/or CS Extension if this is the only information in the medical record regarding one or both of these fields. However the two fields are coded independently; for example, the record may document size but not extension. Use codes 405, 410, 415, 420, 490, 560, 810, and 815 as appropriate to code CS Extension based on a statement of T when no other extension information is available. **Note 4**: Use code 300 for localized tumor only if no information is available to assign codes 100, 200, 400, 405, 410, 415, 420, or 490. **Note 5**: Extension codes 405, 410, 415, 420, and 490 are not compatible with anaplastic carcinomas of the thyroid.### Default

999### NAACCR Item

NAACCR #2810Code | Description | AJCC 7 T | AJCC 6 T | Summary Stage 1977 T | Summary Stage 2000 T |
---|---|---|---|---|---|

000 | In situ, intraepithelial, noninvasive | Determine Correct Table for T | Determine Correct Table for T | IS | IS |

100 | Single invasive tumor confined to thyroid | Determine Correct Table for T | Determine Correct Table for T | L | L |

200 | Multiple foci confined to thyroid | Determine Correct Table for T | Determine Correct Table for T | L | L |

300 | Localized, NOS | Determine Correct Table for T | Determine Correct Table for T | L | L |

400 | Into thyroid capsule, but not beyond | Determine Correct Table for T | Determine Correct Table for T | L | L |

405 | Stated as T1a with no other information on extension | Determine Correct Table for T | Determine Correct Table for T | L | L |

410 | Stated as T1b with no other information on extension | Determine Correct Table for T | Determine Correct Table for T | L | L |

415 | Stated as T1 [NOS] with no other information on extension | Determine Correct Table for T | Determine Correct Table for T | L | L |

420 | Stated as T2 with no other information on extension | Determine Correct Table for T | Determine Correct Table for T | L | L |

450 | Minimal extrathyroid extension including: Strap muscle(s): Omohyoid Sternohyoid Sternothyroid Thyrohyoid |
Determine Correct Table for T | Determine Correct Table for T | RE | RE |

480 | Pericapsular soft tissue/connective tissue | Determine Correct Table for T | Determine Correct Table for T | RE | RE |

490 | Stated as T3 with no other information on extension | Determine Correct Table for T | Determine Correct Table for T | L | L |

500 | Parathyroid Nerves: Recurrent laryngeal Vagus |
Determine Correct Table for T | Determine Correct Table for T | RE | RE |

520 | Cricoid cartilage Esophagus Larynx Sternocleidomastoid muscle |
Determine Correct Table for T | Determine Correct Table for T | RE | RE |

550 | Trachea | Determine Correct Table for T | Determine Correct Table for T | D | D |

560 | Stated as T4a with no other information on extension | Extension T4 SSF1 AJCC7 | T4a | Histology Grade Extension Summary Stage | Histology Grade Extension Summary Stage |

600 | Thyroid cartilage Tumor described as "FIXED to adjacent tissues" |
Extension T4 SSF1 AJCC7 | T4b | RE | RE |

620 | Blood vessel(s) (major): Carotid artery (encased) Jugular vein Thyroid artery or vein |
Extension T4 SSF1 AJCC7 | T4b | RE | RE |

650 | (600 or 620) + 550 Any structures in code 600 or 620 plus trachea |
Extension T4 SSF1 AJCC7 | T4b | D | D |

700 | Bone Skeletal muscle, other than strap or sternocleidomastoid muscle |
Extension T4 SSF1 AJCC7 | T4b | D | D |

720 | OBSOLETE DATA CONVERTED V0200 See code 550 Trachea |
ERROR: | ERROR: | ERROR: | ERROR: |

730 | 700 + 550 Any structures in code 700 plus trachea |
Extension T4 SSF1 AJCC7 | T4b | D | D |

800 | Further contiguous extension including: Mediastinal tissues Prevertebral fascia |
Extension T4 SSF1 AJCC7 | T4b | D | D |

810 | Stated as T4b with no other information on extension | Extension T4 SSF1 AJCC7 | T4b | D | D |

815 | Stated as T4 [NOS] with no other information on extension | Extension T4 SSF1 AJCC7 | T4NOS | RE | RE |

950 | No evidence of primary tumor | Determine Correct Table for T | Determine Correct Table for T | U | U |

999 | Unknown; extension not stated Primary tumor cannot be assessed Not documented in patient record |
Determine Correct Table for T | Determine Correct Table for T | U | U |