CS Extension

Notes

**Note 1**: AJCC does not include a Tis category for gastrointestinal stromal tumors (GIST). Any case with a CS Extension code of 000 is mapped to TX for AJCC 7 stage and in situ Summary Stage. **Note 2**: Ignore intraluminal extension to adjacent segment(s) of esophagus or to cardia of stomach, and code depth of invasion or extra-esophageal spread as indicated. **Note 3**: The assignment of T categories for gastrointestinal stromal tumors (GISTs) 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 170, 210, 250, and 270 as appropriate to code CS Extension based on a statement of T when no other extension information is available.
Code Description AJCC 7 T AJCC 6 T Summary Stage 1977 T Summary Stage 2000 T
000 In situ, intrapethelial, noninvasive TX NA IS IS
100 OBSOLETE DATA RETAINED AND REVIEWED V0203
See codes 155 and 165

Invasive tumor confined to mucosa, NOS (includes intramucosal, NOS)
Extension Size AJCC7 NA L L
110 OBSOLETE DATA RETAINED AND REVIEWED V0203
See codes 155 and 165

Invades lamina propria
Extension Size AJCC7 NA L L
120 OBSOLETE DATA RETAINED AND REVIEWED V0203
See codes 155 and 165

Invades muscularis mucosae
Extension Size AJCC7 NA L L
155 Tumor confined to muscular wall Extension Size AJCC7 NA L L
160 OBSOLETE DATA RETAINED AND REVIEWED V0203
SEE codes 155 and 165

Invades submucosa
Extension Size AJCC7 NA L L
165 Tumor invades through submucosa and muscularis mucosae to involvew mucosa Extension Size AJCC7 NA L L
170 Stated as T1 with no other information on extension Extension Size AJCC7 NA L L
200 OBSOLETE DATA RETAINED AND REVIEWED V0203
See code 155 and 165

Muscularis propria invaded
Extension Size AJCC7 NA L L
210 Stated as T2 with no other information on extension Extension Size AJCC7 NA L L
250 Stated as T3 with no other information on extension Extension Size AJCC7 NA L L
270 Stated as T4 with no other information on extension Extension Size AJCC7 NA L L
300 Localized, NOS Extension Size AJCC7 NA L L
400 Adventitia and/or soft tissue invaded
Esophagus described as fixed
Extension Size AJCC7 NA RE RE
450 OBSOLETE DATA CONVERTED V0203
See code 250

Stated as T3, NOS
ERROR: ERROR: ERROR: ERROR:
560 Invasion into adventitia with invasion of/through mucosa Extension Size AJCC7 NA RE RE
600 OBSOLETE DATA RETAINED V0200
See codes 610 and 730

Tumor invades adjacent structures
Cervical esophagus:
Blood vessel(s):
Carotid artery
Jugular vein
Subclavian artery
Thyroid gland
Intrathoracic, upper or mid-portion, esophagus:
Blood vessel(s), major:
Aorta
Azygos vein
Pulmonary artery/vein
Vena cava
Carina
Diaphragm
Main stem bronchus
Trachea
Intrathoracic, lower portion (abdominal), esophagus:
Blood vessel(s):
Aorta
Gastric artery/vein
Vena cava
Diaphragm, not fixed, or NOS
Stomach, cardia (via serosa)
ERROR: NA RE RE
610 Tumor invades adjacent structures:
For cervical esophagus:
Hypopharynx
Jugular vein
Larynx
Thyroid gland
For intrathoracic, upper or mid-portion, esophagus:
Blood vessel(s), major:
Azygos vein
Diaphragm
For intrathoracic, lower portion (abdominal), esophagus:
Blood vessel(s), major:
Gastric artery/vein
Diaphragm, not fixed;diaphragm, NOS
Stomach, cardia (via serosa)
For intrathoracic esophagus, NOS:
Pleura
Extension Size AJCC7 NA RE RE
650 OBSOLETE DATA RETAINED V0200
See codes 610, 680, and 730

Cervical esophagus:
Carina
Cervical vertebra(e)
Hypopharynx
Larynx
Trachea
Intrathoracic esophagus:
Lung via bronchus
Mediastinal structure(s), NOS
Pleura
Rib(s)
Thoracic vertebra(e)
ERROR: NA RE RE
660 For thoracic/middle esophagus:
Pericardium
Extension Size AJCC7 NA RE D
680 For cervical/upper esophagus:
Pleura
For abdominal/lower esophagus:
Diaphragm fixed
Extension Size AJCC7 NA D D
700 OBSOLETE DATA CONVERTED V0203
See code 270

Stated as T4 [NOS]
ERROR: ERROR: ERROR: ERROR:
730 Tumor invades adjacent structures:
For cervical esophagus:
Blood vessel(s), major:
Carotid artery
Subclavian artery
Carina
Cervical vertebra(e)
Trachea
For intrathoracic, upper or mid-portion, esophagus:
Blood vessel(s), major:
Aorta
Pulmonary artery/vein
Vena cava
Carina
Main stem bronchus
Trachea
For intrathoracic, lower portion (abdominal), esophagus:
Blood vessel(s), major:
Aorta
Vena cava
For intrathoracic esophagus, NOS:
Adjacent Rib(s)
Lung via bronchus
Mediastinal structure(s), NOS
Thoracic vertebra(e)
Extension Size AJCC7 NA RE RE
740 730 + 660

Any structure in code 730 involving thoracic/middle esophagus plus pericardium
Extension Size AJCC7 NA RE D
745 730 + 680

Any structure in code 730 involving cervical/upper esophagus plus pleura
OR
Any structure in code 730 involving abdominal /lower esophagus plus fixation of diaphragm
Extension Size AJCC7 NA D D
750 For cervical/upper esophagus:
Lung
Main stem bronchus
Extension Size AJCC7 NA D D
780 OBSOLETE DATA RETAINED V0200
See code 660

Thoracic/middle esophagus:
Pericardium
ERROR: NA RE D
800 OBSOLETE DATA RETAINED V0200
See codes 680 and 750

Further contiguous extension:
Cervical/upper esophagus:
Lung
Main stem bronchus
Pleura
Abdominal/lower esophagus:
Diaphragm fixed
ERROR: NA D D
810 Further contiguous extension Extension Size AJCC7 NA D D
950 No evidence of primary tumor T0 NA U U
999 Unknown; extension not stated
Primary tumor cannot be assessed
Not documented in patient record
TX NA U U
- For CS Extension codes 100-810 ONLY, the T category for AJCC 7 staging is assigned based on the value of CS Tumor Size, as shown in the Extension Size AJCC 7 Table for this schema.