CS Extension

Notes

**Note 1**: AJCC 7th Edition T1 and T2 categories are based on size and high risk features and not depth of invasion or extension. AJCC 7th Edition does not include a T3 category for scrotum. **Note 2**: The assignment of the T1 category for cutaneous squamous cell carcinomas with one or no high-risk features is based on tumor size. A physician's statement of the T1 category may be used to code both 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. Use codes 310, 320, and 810 as appropriate to code CS Extension based on a statement of T when no other extension information is available. **Note 3**: Use code 300 (Localized, NOS) when no further information is available to assign code 100, 305, 310, or 320.
Code Description AJCC 7 T AJCC 6 T Summary Stage 1977 T Summary Stage 2000 T
000 In situ, intraepidermal, intraepithelial, noninvasive
Bowen disease		 Tis Tis IS IS
100 Confined to scrotum Extension Size High Risk Extension Size AJCC6 L L
300 Localized, NOS Extension Size High Risk Extension Size AJCC6 L L
305 Subcutaneous tissue Extension Size High Risk Extension Size AJCC6 L L
310 Stated as T1 with no other information on extension Extension Size High Risk Extension Size AJCC6 L L
320 Stated as T2 with no other information on extension T2 T2 L L
400 OBSOLETE DATA RETAINED AND REVIEWED V0203
See codes 450 and 500

Adjacent connective tissue
(See definition of connective tissue in General Rules, Part I)		 Extension Size High Risk Extension Size AJCC6 RE RE
450 Adjacent connective tissue excluding skeletal muscle Extension Size High Risk Extension Size AJCC6 RE RE
500 Skeletal muscle Extension Size High Risk T4 RE RE
600 Adjacent organs/structures:
Male genital organs:
Epididymis
Penis
Prostate
Spermatic cord
Testis		 Extension Size High Risk T4 RE RE
650 Underlying cartilage Extension Size High Risk T4 D D
800 Further contiguous extension:
Other organs and structures in male pelvis:
Bladder
Rectum
Urethra		 Extension Size High Risk T4 D D
805 Bone:
Axial or appendicular skeleton		 T4 T4 D D
810 Stated as T4 with no other information on extension T4 T4 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 100-310 and 400-800 ONLY, the T category for AJCC 7 staging is assigned based on the value of CS Tumor Size and CS Site-Specific Factor 12, High Risk Features, as shown in the Extension Size High Risk Table for this schema. - For CS Extension codes 100-310, 400, and 450 ONLY, the T category for AJCC 6 staging is assigned based on the value of CS Tumor Size, as shown in the Extension Size AJCC 6 Table for this schema.