CS Extension

Notes

**Note 1**: The assignment of T1 and T2 categories for tumors of the oropharynx is based on tumor size. A physician's statement of the T category may be used to code 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, other than the physician's statement of the T category. Use codes 305, 310, 540, 705, 810, or 815 as appropriate to code CS Extension based on a statement of T when no other extension information is available. **Note 2**: Use code 300 for localized tumor only if no information is available to assign code 150, 200, 305, 310, or 530.
Code Description AJCC 7 T AJCC 6 T Summary Stage 1977 T Summary Stage 2000 T
000 In situ, intraepithelial, noninvasive Tis Tis IS IS
100 OBSOLETE DATA RETAINED V0200
Epiglottis mapped to T3 in CSv2, see code 530

Invasive tumor confined to one of the following subsites:
Anterior wall (including vallecula and lingual (anterior) surface of epiglottis)
One lateral wall
Posterior wall		 ERROR: Extension Size AJCC6 L L
150 Invasive tumor confined to one of the following subsites:
Anterior wall including vallecula
One lateral wall (including tonsillar pillar/fossa, palatine tonsil, tonsil, NOS)
Posterior wall 		Extension Size AJCC7 Extension Size AJCC6 L L
200 Involvement of two or more subsites listed in code 100:
Posterior, anterior, lateral wall(s)		 Extension Size AJCC7 Extension Size AJCC6 L L
300 Localized, NOS Extension Size AJCC7 Extension Size AJCC6 L L
305 Stated as T1 with no other information on extension Extension Size AJCC7 Extension Size AJCC6 L L
310 Stated as T2 with no other information on extension Extension Size AJCC7 Extension Size AJCC6 L L
400 Soft palate, inferior surface including uvula
Soft palate, NOS		 Extension Size AJCC7 Extension Size AJCC6 RE RE
410 OBSOLETE DATA CONVERTED V0200
T4a involvement per curator, see code 630

Hypopharynx NOS
Pyriform sinus		 ERROR: ERROR: ERROR: ERROR:
420 Soft palate, superior (nasopharyngeal) surface Extension Size AJCC7 Extension Size AJCC6 RE RE
500 Base of tongue (including lingual tonsil)
Buccal mucosa (inner cheek)
Floor of mouth
Gum (gingiva)		 Extension Size AJCC7 Extension Size AJCC6 RE RE
510 Any site in codes 150-500 WITH fixation Extension Size AJCC7 Extension Size AJCC6 RE RE
520 Involvement of both lateral walls through soft palate or base of tongue Extension Size AJCC7 Extension Size AJCC6 D RE
530 Epiglottis, lingual surface T3 Extension Size AJCC6 L L
531 530 + 200 T3 Extension Size AJCC6 L L
533 530 + (400, 420, 500, 510)

Epiglottis, lingual surface plus any structure in codes 400, 420, 500, and 510 		T3 Extension Size AJCC6 RE RE
535 530 WITH fixation
WITH or WITHOUT involvement of any site in codes 400, 420, 500, and 510		 T3 Extension Size AJCC6 RE RE
538 530 +520

Epiglottis, lingual surface, plus both lateral walls through soft palate or base of tongue		 T3 Extension Size AJCC6 D RE
540 Stated as T3 with no other information on extension T3 Extension Size AJCC6 RE RE
550 OBSOLETE DATA RETAINED V0200
Extension to lingual surface of epiglottis assigned to T3 in AJCC 7
See codes 510, 535

Any extension coded in 100-500 WITH fixation 		ERROR: Extension Size AJCC6 RE RE
600 OBSOLETE DATA REVIEWED AND CHANGED V0203
T4 involvement per curator , see codes 610, 635, 675, 708, 715, 718

Prevertebral fascia or muscle
Soft tissue of neck		 ERROR: ERROR: ERROR: ERROR:
610 Soft tissue of neck T4a T4a RE RE
620 OBSOLETE DATA CONVERTED V0200
See code 710

Nasopharynx, lateral, or NOS		 ERROR: ERROR: ERROR: ERROR:
630 Hypopharynx NOS
Pyriform sinus		 T4a T4a RE RE
635 630 + (420, 500, 510, 535, or 610) T4a T4a RE RE
650 Larynx, NOS
Medial pterygoid muscle, or pterygoid muscle, NOS
Posterior surface of epiglottis		 T4a T4a RE RE
675 (610, 630, 650) + 520

Involvement of any structure in codes 610, 630, and 650 plus involvement of both lateral walls through soft palate or base of tongue 		T4a T4a D RE
700 Deep extrinsic muscles of tongue:
Genioglossus
Geniohyoid
Hyoglossus
Mylohyoid
Palatoglossus
Styloglossus
Hard palate
Mandible		 T4a T4a D D
705 Stated as T4a with no other information on exension T4a T4a RE RE
708 Prevertebral fascia/muscle T4b T4b RE RE
710 Nasopharynx, lateral or NOS T4b T4b RE RE
715 (708 or 710) + 520

Prevertebral fascia/muscle or nasopharynx plus involvement of both lateral walls through soft palate or base of tongue		 T4b T4b D RE
718 (708 and/or 710) + 700

Prevertebral fascia/muscle or nasopharynx plus any structure in code 700		 T4b T4b D D
720 Lateral pterygoid muscle
Pterygoid plates		 T4b T4b D D
750 Base of skull
Bone of skull
Bone, NOS (excluding bones in codes 700, 720)		 T4b T4b D D
760 OBSOLETE DATA CONVERTED V0200
See code 750

Bone 		ERROR: ERROR: ERROR: ERROR:
770 Carotid artery (encased) T4b T4b D D
800 Further contiguous extension:
Anterior 2/3 of tongue
Parotid gland		 T4b T4b D D
810 Stated as T4b with no other information on extension T4b T4b D D
815 Stated as T4 [NOS] with no other information on extension T4NOS T4NOS RE RE
950 No evidence of primary tumor T0 T0 U U
999 Unknown; extension not stated
Primary tumor cannot be assessed
Not documented in patient record		 TX TX U U
- For CS Extension codes 150-520 ONLY, the T category for AJCC 7staging is assigned based on the value of CS Tumor Size as shown in the Extension Size AJCC 7 Table for this schema. - For CS Extension codes 100-550 ONLY, the T category for AJCC 6 staging is assigned based on the value of CS Tumor Size as shown in the Extension Size AJCC 6 Table for this schema.