CS Extension

This input is used for staging

Notes

**Note 1**: Parapharyngeal involvement denotes postero-lateral infiltration of tumor beyond the pharyngobasilar fascia. The pharyngobasilar fascia is the fibrous layer of the pharyngeal wall between the mucosa and the muscular layer, attached superiorly to the basilar part of the occipital bone and diminishing in thickness as it descends. **Note 2**: The masticator space primarily consists of the muscles of mastication, the medial and lateral pterygoid, masseter, and temporalis muscles. The space also includes the ramus of the mandible and the third division of cranial nerve V as it passes through the foramen ovale into the suprahyoid neck. **Note 3**: Use code 300 for localized tumor ONLY if no information is available to assign codes 105 or 205. **Note 4**: Use code 510, 585, 645, or 810 if the physician's assignment of T category is the ONLY information available about the extent of the tumor.

Default

999

NAACCR Item

NAACCR #2810
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

Invasive tumor confined to one of the following subsites:
Inferior wall (superior surface of soft palate)
One lateral wall
Posterior superior wall (vault)
ERROR: T1 L L
105 Invasive tumor confined to one of the following subsites:
Inferior wall (superior surface of soft palate)
One lateral wall
Posterior superior wall (vault)
T1 T1 L L
200 OBSOLETE DATA RETAINED V0200

Involvement of two or more subsites:
Lateral wall extending into eustachian tube/middle ear
Posterior, inferior, or lateral wall(s)
ERROR: T1 L L
205 Involvement of two or more subsites:
Lateral wall extending into eustachian
tube/middle ear
Posterior, inferior, or lateral wall(s)
T1 T1 L L
300 OBSOLETE DATA RETAINED V0200

Confined to nasopharynx
Localized, NOS
ERROR: T1 L L
305 Confined to nasopharynx
Localized, NOS
T1 T1 L L
400 Oropharynx
Soft palate, inferior surface including uvula
WITHOUT parapharyngeal extension
T1 T2a RE RE
500 Nasal cavity
WITHOUT parapharyngeal extension
T1 T2a RE RE
505 Extension to soft tissue, NOS (excluding soft tissue of neck) T1 T2NOS RE RE
510 Stated as T1 with no other information on extension T1 T1 L L
520 OBSOLETE DATA CONVERTED V0203
See code 505

Extends to soft tissue NOS
ERROR: ERROR: ERROR: ERROR:
550 OBSOLETE DATA RETAINED V0200

Any extension coded in 100-500 WITH fixation or tumor
Described only as FIXED
ERROR: T4 RE RE
555 Any extension coded in 105, 205, 305, 400, 500, or 505
WITH fixation or tumor described only as FIXED
T2 T2b RE RE
560 OBSOLETE DATA RETAINED V0200

Any extension coded in 100-500 WITH parapharyngeal extension
ERROR: T2b RE RE
565 Any extension coded in 105, 205, 305, 400, 500, 505, or 555
WITH parapharyngeal extension
T2 T2b RE RE
570 OBSOLETE DATA CONVERTED V0200
See code 610

Hard palate
ERROR: ERROR: ERROR: ERROR:
580 OBSOLETE DATA RETAINED V0200

Pterygopalatine fossa
ERROR: T2b RE RE
585 Pterygopalatine fossa
WITHOUT bone invasion
T2 T2b RE RE
590 Stated as T2 with no other information on extension T2 T2b RE RE
600 OBSOLETE DATA RETAINED V0200

Bone, including skull
ERROR: T3 RE RE
605 Bony structures of skull base
Floor of orbit
Cartilage, NOS
Bone, NOS
T3 T3 RE RE
610 Hard Palate T3 T3 D RE
620 Paranasal sinus T3 T3 D RE
645 Stated as T3 with no other information on extension T3 T3 RE RE
650 OBSOLETE DATA REVIEWED AND CHANGED V0200
In CSv1, extension to the orbit was included in both codes 650 and 700. In addition, the instructions for coding invasion of orbital bone were not clear. Codes 650 and 700 should be reviewed for orbital involvement. Involvement of bone of floor of orbit should be coded 605, and other orbit involvement should be coded 710.

Orbit
ERROR: ERROR: ERROR: ERROR:
700 OBSOLETE DATA REVIEWED AND CHANGED V0200
See note in code 650

Brain
Cranial nerves
Hypopharynx
Infratemporal fossa
Orbit
Intracranial extension, NOS
ERROR: ERROR: ERROR: ERROR:
710 Brain
Cranial nerve involvement
Intracranial extension, NOS
Hypopharynx
Infratemporal fossa/masticator space
Orbit except bone of floor of orbit (see code 605)
T4 T4 D D
750 OBSOLETE DATA CONVERTED V0200
See code 710

Masticator space
ERROR: ERROR: ERROR: ERROR:
800 Further contiguous extension including:
Soft tissues of neck
T4 T4 D D
810 Stated as T4 with no other information on extension T4 T4 RE D
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