CS Extension

Notes

**Note 1**: The bones of the lateral wall of the nasal cavity include the maxilla, the perpendicular plate of the palatine bone, the medial pterygoid plate, the labyrinth and inferior concha of the ethmoid. The roof of the nasal cavity is formed by the nasal bone. The floor of the nasal cavity, which forms the roof of the mouth, is composed of the bones of the hard palate: the horizontal plate of the palatine bone posteriorly and the palatine process of the maxilla anteriorly. **Note 2**: "Bony invasion" does not include extension to palate, cribriform plate, or pterygoid plates. Extension to these structures is coded separately. **Note 3**: Code Base of skull NOS only if no information is available to code to more specific bony structures in the skull. **Note 4**: In code 700, "minimal extension to anterior cranial fossa" implies tumor pushing through the cribriform plate, but without invasion of the dura or brain. **Note 5**: Use code 300 for localized tumor only if no information Is available to assign code 100, 110, 200, or 410. **Note 6**: Use code 110, 410, 680, 725, 810, or 815 if the physician's assignment of T category is the only information available about the extent of the tumor.
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 Invasive tumor confined to one of the following subsites:
Septum
Floor
Lateral wall, including:
Meatus (superior, middle, inferior)
Nasal conchae (superior, middle, inferior)
Vestibule (edge of naris to mucocutaneous junction)
WITHOUT bony invasion
T1 T1 L L
105 Invasive tumor confined to one subsite listed in code 100
WITH bony invasion
T1 T1 RE RE
110 Confined to nasal cavity, NOS

Stated as T1 with no other information on extension
T1 T1 L L
200 Invasive tumor confined to two or more subsites listed in code 100
WITHOUT bony invasion
T2 T2 L L
205 Invasive tumor confined to two or more subsites listed in code 100
WITH bony invasion
T2 T2 RE RE
300 Localized, NOS T1 T1 L L
400 Extending to adjacent region within the nasoethmoidal complex:
Nasolacrimal duct
Ethmoid sinus
Choana
WITH or WITHOUT bony invasion
T2 T2 RE RE
410 Stated as T2 with no further information on extension T2 T2 RE RE
600 OBSOLETE DATA REVIEWED AND CHANGED V0203
Code 600 defined as "Adjacent organs/structures including: Bone of skull, Choana, Frontal sinus, Hard palate, Nasopharynx" in CSv1. Code 600 defined as "Adjacent organs/structures including: Base of skull NOS, Palate" in CSV2: V0201, V0202. Extension to frontal sinus and extension to nasopharynx were each included in two codes in CSv1. Review and recode all cases to code 400, 610, 690, 695, 730, 740, or 780 as appropriate.

Adjacent organs/structures including:
Base of skull, NOS
Palate
ERROR: ERROR: ERROR: ERROR:
610 Adjacent organs/structures including:
Base of skull, NOS
Hard palate
T3 T3 RE RE
650 Cribiform plate T3 T3 RE RE
660 Maxillary sinus T3 T3 D D
670 Medial wall or floor of the orbit T3 T3 D D
680 Stated as T3 with no other information on extension T3 T3 RE RE
690 Frontal sinus
Pterygoid plates
T4a T4a RE RE
695 690 + (660 or 670)

Any structure in code 690 plus any structure in code 660 or 670
T4a T4a D D
700 OBSOLETE DATA REVIEWED AND CHANGED V0203
Code 700 defined as "Tumor invades: Anterior orbital contents, Skin of nose, Skin of Cheek, Minimal extension to: Anterior cranial fossa, Sphenoid or frontal sinuses" in CSv1. Code 700 defined as "Tumor invades: Anterior orbital contents, skin of nose, Skin of cheek, Anterior cranial fossa (minimal extension), Sphenoid sinus" in CSv2:V0201, V0202. Frontal sinus included in two codes, 600 and 700, in CSv1. Review and recode all cases to codes 690, 695, 705, 740, or 780 as appropriate.

Tumor invades:
Anterior orbital contents
Skin of nose
Skin of cheek
Anterior cranial fossa
Sphenoid sinus
ERROR: ERROR: ERROR: ERROR:
705 Anterior orbital contents
Skin of nose
Skin of cheek
Anterior cranial fossa (minimal extension)
Sphenoid sinus
T4a T4a D D
710 OBSOLETE DATA CONVERTED V0200
See code 760

Tumor invades:
Orbital apex
Dura
Brain
Middle cranial fossa
Cranial nerves other than (V2), nasopharynx, or clivus
ERROR: ERROR: ERROR: ERROR:
725 Stated as T4a with no other information on extension T4a T4a RE RE
730 Nasopharynx T4b T4b RE RE
740 730 + (660, 670, 695, 705) T4b T4b D D
760 OBSOLETE DATA REVIEWED AND CHANGED V0203
Nasopharynx included in codes 600 and 710 in CSv1; code 710 converted to 760 in CSv2:0200. Review and recode nasopharynx and other structures to codes 730, 740, 770, or 780

Further contiguous extension including:
Brain
Clivus
Cranial nerves (other than V2, maxillary division of trigeminal nerve)
Dura
Middle cranial fossa
Nasopharynx
Orbital apex
ERROR: ERROR: ERROR: ERROR:
770 Further contiguous extension including:
Brain
Clivus
Cranial nerves (other than V2, maxillary division of trigeminal nerve)
Dura
Middle cranial fossa
Orbital apex
T4b T4b D D
780 770 + (730, 740) 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