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 or 305.
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, submandibular)
Skeletal muscle:
Digastric
Pterygoid
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
505 OBSOLETE DATA CONVERTED V0203
See code 515

(450 or 510) + 405

(Any structure in code 450 or 510 + Spinal accessory nerve)		 ERROR: ERROR: ERROR: ERROR:
510 Mandible
Nerves:
Facial (7th)
Lingual		 T4a T4a RE RE
515 (450 or 510) + 402 T4a T4a RE RE
518 (450 or 510) + 405 T4a T4a D D
600 Skin T4a T4a D D
620 External auditory meatus T4a T4a D D
623 (600 or 620) + 402 T4a T4a D D
625 Stated as T4a with no other information on extension T4a T4a RE RE
650 OBSOLETE DATA REVIEWED AND CHANGED V0203
Recode involved structures to code 402, 515, 623, 655, or 660 as appropriate

Blood vessel(s):
Carotid artery
Facial artery or vein
Maxillary artery		 ERROR: ERROR: ERROR: ERROR:
655 Carotid artery (encased) T4b T4b RE RE
660 655 + (405, 600, or 620)

Carotid artery plus any structures in code 405, 600, or 620		 T4b T4b D D
710 Base of skull
Skull, NOS		 T4b T4b D D
720 OBSOLETE DATA CONVERTED V0200
See code 405

Spinal accessory nerve		 ERROR: ERROR: ERROR: ERROR:
790 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 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 value of CS Tumor Size as shown in the Extension Size Table for this schema.