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 extraparenchymal 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, 410, 725, 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
Multiple foci confined to substance of parotid gland
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 (submaxillary, sublingual)
Pharyngeal mucosa
Skeletal muscle:
Digastric
Masseter
Pterygoid
Sternocleidomastoid
Stylohyoid
T3 T3 RE RE
402 Maxillary artery
Facial artery or vein
T3 T3 RE RE
405 Spinal accessory nerve T3 T3 RE D
406 405 + 402 T3 T3 RE D
408 Stated as T3 with no other information on extension T3 T3 RE RE
420 External auditory meatus
Skin overlying gland
T4a T4a RE RE
450 Periosteum of mandible T4a T4a RE RE
500 Auricular nerve
Mandible
Mastoid process
T4a T4a RE RE
505 (420, 450, 500) +402 T4a T4a RE D
510 (420, 450, 500) + 405

Any structure in code 420, 450, or 500 plus spinal accessory nerve
T4a T4a RE D
700 Facial (7th) nerve T4a T4a RE D
705 700 + 402 T4a T4a RE D
708 700 + 405 T4a T4a RE D
720 OBSOLETE DATA CONVERTED V0200
See code 405

Spinal accessory nerve
ERROR: ERROR: ERROR: ERROR:
725 Stated as T4a with no other information on extension T4a T4a RE RE
740 Carotid artery (encased)
Jugular vein
T4b T4b RE RE
750 OBSOLETE DATA REVIEWED AND CHANGED V0203
Recode involved structures to 402, 406, 505, 705, 740, 755, 758 as appropriate.

Major blood vessel(s):
Carotid artery (encased)
Facial artery or vein
Jugular vein
Maxillary artery
ERROR: ERROR: ERROR: ERROR:
755 740 + 405

Any structure in code 740 plus spinal accessory nerve
T4b T4b RE D
758 740 + 700

Any structure in code 740 plus facial nerve
T4b T4b RE D
760 Base of skull
Skull, NOS
T4b T4b RE D
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 RE RE
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.