CS Extension

Notes

**Note 1**: AJCC considers "in situ carcinoma of salivary gland" an impossible diagnosis. Any case so coded will be mapped to an unknown AJCC stage, in situ Summary Stage. **Note 2**: Periosteum is a fibrous membrane that wraps the outer surface of bones. Mucoperiosteum is a compound structure of mucous membrane and periosteum. Cortical bone is the dense compact outer layer of bone. **Note 3**: The assignment of T1 and T2 categories for tumors of major salivary glands without exparenchymal extension 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, 408, 625, 810, or 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, 305, or 310.
Code Description AJCC 7 T AJCC 6 T Summary Stage 1977 T Summary Stage 2000 T
000 In situ, intraepithelial, noninvasive TX TX IS IS
100 Invasive tumor confined to gland/duct of origin Extension Size Extension Size L L
300 Localized, NOS Extension Size Extension Size L L
305 Stated as T1 with no other information on extension Extension Size Extension Size L L
310 Stated as T2 with no other information on extension Extension Size Extension Size L L
350 Microscopic extraparenchymal extension ONLY to periglandular soft/connective tissue Extension Size Extension Size RE RE
400 Macroscopic extraparenchymal extension to:
Periglandular soft/connective tissue
Another major salivary gland (parotid, sublingual)
Skeletal muscle:
Digastric
Genioglossus
Geniohyoid
Hyoglossus
Mylohyoid
Pterygoid
Styloglossus
Stylohyoid		 T3 T3 RE RE
402 Maxillary artery
Facial artery or vein		 T3 T3 RE RE
405 Spinal accessory nerve T3 T3 D D
408 Stated as T3 with no other information on extension T3 T3 RE RE
450 Periosteum of mandible T4a T4a RE RE
500 Mandible
Nerves:
Facial (7th) nerve
Lingual nerve		 T4a T4a RE RE
503 500 + 402 T4a T4a RE RE
505 (450 or 500) + 405

Any structure in 450 or 500 plus spinal accessory nerve		 T4a T4a D D
510 External auditory meatus T4a T4a D D
515 510 + 402 T4a T4a D D
520 OBSOLETE DATA RETAINED V0200
See codes 402 and 650

Major blood vessels:
Carotid artery
Facial artery or vein
Maxillary artery		 ERROR: T4b RE RE
600 Skin overlying gland T4a T4a D D
625 Stated as T4a with no other information on extension T4a T4a RE RE
650 Blood vessels:
Carotid artery (encased)		 T4b T4b RE RE
660 650 + (405, 510, or 600)

Carotid artery plus any structures in codes 405, 510, and 600		 T4b T4b D D
710 Base of skull
Skull, NOS		 T4b T4b D D
715 (510 or 710) + 405 T4b T4b D D
720 OBSOLETE DATA CONVERTED V0200
See code 405

Spinal accessory nerve		 ERROR: ERROR: ERROR: ERROR:
770 Pterygoid plates T4b T4b D D
800 Further contiguous extension 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 100-350 ONLY, the T category for AJCC 7 staging is assigned based on the value of CS Tumor Size as shown in the Extension Size Table for this schema. - For CS Extension codes 100-350 ONLY, the T category for AJCC 6 staging is assigned based on the value of CS Tumor Size as shown in the Extension Size Table for this schema.