CS Extension

Notes

**Note 1**: Uveal melanomas arise most commonly in the choroid, less frequently in the ciliary body, and least often in the iris. **Note 2**: AJCC does not recognize in situ melanoma of the choroid. Any case so coded will be mapped to unknown AJCC stage and in situ Summary Stage. **Note 3**: The AJCC 7th Edition assigns a T value to combinations of measurements for basal diameter and thickness of tumor divided into four Tumor Size Categories in a charted format. The AJCC 6th Edition assigned T values based on three pairs of measurements for basal diameter and thickness, using the basal diameter for classification when the two measurements did not fit into the defined pairs. **Note 4**: According to the AJCC, "In clinical practice the largest tumor basal diameter may be estimated in optic disc diameters (dd) (average: 1 dd = 1.5mm). Tumor thickness may be estimated in diopters (average: 2.5 diopters = 1 mm). However, techniques, such as ultrasonography and fundus photography are used to provide more accurate measurements." **Note 5**: Use codes 150 through 180 if measurements are available to record the largest tumor basal diameter and tumor thickness. Only use codes 205 through 445 or 640 if measurements are not available for coding. Note that code 635, mapped to T4e, is not based on a Tumor Size Category assignment. **Note 6**: Only use codes 245, 295, 345, and 445 if the tumor size category is the only information available about the tumor.
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
150 Tumor WITHOUT ciliary body involvement
WITHOUT extraocular extension
(Or ciliary body involvement and extraocular extension not stated)		 Tumor Size Category AJCC7 Tumor Size Pair AJCC6 L L
160 Tumor WITH ciliary body involvement
WITHOUT extraocular extension
(Or extraocular extension not stated)		 Tumor Size Category AJCC7 Tumor Size Pair AJCC6 L L
170 Tumor WITHOUT ciliary body involvement
(Or ciliary involvement not stated)
WITH extraocular extension less than or equal to 5 mm in diameter
(OR extraocular extension diameter not stated)		 Tumor Size Category AJCC7 Tumor Size Pair AJCC6 RE RE
180 Tumor WITH ciliary body involvement
WITH extraocular extension less than or equal to 5 mm in diameter
(OR extraocular extension diameter not stated)		 Tumor Size Category AJCC7 Tumor Size Pair AJCC6 RE RE
205 Tumor WITHOUT ciliary body involvement
WITHOUT extraocular extension
(Or ciliary body involvement and extraocular extension not stated)
AND stated as Tumor Size Category 1

Stated as T1a with no other information on extension		 T1a T1a L L
215 Tumor WITH ciliary body involvement
WITHOUT extraocular extension
(Or extraocular extension not stated)
AND stated as Tumor Size Category 1

Stated as T1b with no other information on extension		 T1b T1a L L
220 OBSOLETE DATA RETAINED V0200

Tumor 10 mm or less in greatest diameter and 2.5 mm or less in greatest height (thickness),
AND extraocular invasion unknown		 ERROR: T1NOS L L
225 Tumor WITHOUT ciliary body involvement
(Or ciliary involvement not stated)
WITH extraocular extension less than or equal to 5 mm in diameter
(OR extraocular extension diameter not stated)
AND stated as Tumor Size Category 1

Stated as T1c with no other information on extension		 T1c T1b RE RE
235 Tumor WITH ciliary body involvement
WITH extraocular extension less than or equal to 5 mm in diameter
(OR extraocular extension diameter not stated)
AND stated as Tumor Size Category 1

Stated as T1d with no other information on extension		 T1d T1b RE RE
240 OBSOLETE DATA RETAINED V0200

Tumor 10 mm or less in greatest diameter and 2.5 mm or less in greatest height (thickness),
WITHOUT microscopic extraocular extension		 ERROR: T1a L L
245 Tumor Size Category 1, NOS

Stated as T1 [NOS] with no other information on extension		 T1NOS T1NOS L L
255 Tumor WITHOUT ciliary body involvement
WITHOUT extraocular extension
(Or ciliary body involvement and extraocular extension not stated)
AND stated as Tumor Size Category 2

Stated as T2a with no other information on extension		 T2a T2a L L
260 OBSOLETE DATA RETAINED V0200

Tumor 10 mm or less in greatest diameter and 2.5 mm or less in greatest height (thickness),
WITH microscopic extraocular extension		 ERROR: T1b RE RE
265 Tumor WITH ciliary body involvement
WITHOUT extraocular extension
(Or extraocular extension not stated)
AND stated as Tumor Size Category 2

Stated as T2b with no other information on extension		 T2b T2a L L
275 Tumor WITHOUT ciliary body involvement
(Or ciliary involvement not stated)
WITH extraocular extension less than or equal to 5 mm in diameter
(OR extraocular extension diameter not stated)
AND stated as Tumor Size Category 2

Stated as T2c with no other information on extension		 T2c T2b RE RE
280 OBSOLETE DATA RETAINED V0200

Tumor 10 mm or less in greatest diameter and 2.5 mm or less in greatest height (thickness),
WITH macroscopic extraocular extension		 ERROR: T1c RE RE
285 Tumor WITH ciliary body involvement
WITH extraocular extension less than or equal to 5 mm in diameter
(OR extraocular extension diameter not stated)
AND stated as Tumor Size Category 2

Stated as T2d with no other information on extension		 T2d T2b RE RE
295 Tumor Size Category 2, NOS

Stated as T2 [NOS] with no other information on extension		 T2NOS T2NOS L L
300 Localized, NOS T1NOS T1NOS L L
305 Tumor WITHOUT ciliary body involvement
WITHOUT extraocular extension
(Or ciliary body involvement and extraocular extension not stated)
AND stated as Tumor Size Category 3

Stated as T3a with no other information on extension		 T3a T3 L L
315 Tumor WITH ciliary body involvement
WITHOUT extraocular extension
(Or extraocular extension not stated)
AND stated as Tumor Size Category 3

Stated as T3b with no other information on extension		 T3b T3 L L
325 Tumor WITHOUT ciliary body involvement
(Or ciliary involvement not stated)
WITH extraocular extension less than or equal to 5 mm in diameter
(OR extraocular extension diameter not stated)
AND stated as Tumor Size Category 3

Stated as T3c with no other information on extension		 T3c T4 RE RE
335 Tumor WITH ciliary body involvement
WITH extraocular extension less than or equal to 5 mm in diameter
(OR extraocular extension diameter not stated)
AND stated as Tumor Size Category 3

Stated as T3d with no other information on extension		 T3d T4 RE RE
345 Tumor Size Category 3, NOS

Stated as T3 [NOS] with no other information on extension		 T3NOS T3 L L
405 Tumor WITHOUT ciliary body involvement
WITHOUT extraocular extension
(Or ciliary body involvement and extraocular extension not stated)
AND stated as Tumor Size Category 4

Stated as T4a with no other information on extension		 T4a T3 L L
415 Tumor WITH ciliary body involvement
WITHOUT extraocular extension
(Or extraocular extension not stated)
AND stated as Tumor Size Category 4

Stated as T4b with no other information on extension		 T4b T3 L L
420 OBSOLETE DATA RETAINED V0200

Tumor greater than 10 mm but not more than 16 mm in greatest basal diameter and between 2.5 mm and 10 mm in maximum height (thickness),
AND extraocular invasion unknown		 ERROR: T2NOS L L
425 Tumor WITHOUT ciliary body involvement
(Or ciliary involvement not stated)
WITH extraocular extension less than or equal to 5 mm in diameter
(OR extraocular extension diameter not stated)
AND stated as Tumor Size Category 4

Stated as T4c with no other information on extension		 T4c T4 RE RE
435 Tumor WITH ciliary body involvement
WITH extraocular extension less than or equal to 5 mm in diameter
(OR extraocular extension diameter not stated)
AND stated as Tumor Size Category 4

Stated as T4d with no other information on extension		 T4d T4 RE RE
440 OBSOLETE DATA RETAINED V0200

Tumor greater than 10 mm but not more than 16 mm in greatest basal diameter and between 2.5 mm and 10 mm in maximum height (thickness),
WITHOUT microscopic extraocular invasion		 ERROR: T2a L L
445 Stated as Tumor Size Category 4, NOS T4NOS T3 L L
460 OBSOLETE DATA RETAINED V0200

Tumor greater than 10 mm but not more than 16 mm in greatest
basal diameter and between 2.5 mm and 10 mm in maximum height (thickness),
WITH microscopic extraocular invasion		 ERROR: T2b RE RE
480 OBSOLETE DATA RETAINED V0200

Tumor greater than 10 mm but not more than 16 mm in greatest basal diameter and between 2.5 mm and 10 mm in maximum height (thickness),
WITH macroscopic extraocular invasion		 ERROR: T2c RE RE
635 Tumor WITH extraocular extension greater than 5 mm in diameter

Stated as T4e with no other information on extension		 T4e Tumor Size Pair AJCC6 RE RE
640 Stated as T4 [NOS] with no other information on extension T4NOS Tumor Size Pair AJCC6 L L
660 OBSOLETE DATA RETAINED V0200

Tumor greater than 16 mm in greatest diameter and/or greater than 10 mm in maximum height (thickness)
WITHOUT extraocular extension		 ERROR: T3 L L
680 OBSOLETE DATA RETAINED V0200

Tumor greater than 16 mm in greatest diameter and/or greater than 10 mm in maximum height (thickness)
WITH extraocular extension		 ERROR: T4 RE RE
800 Further contiguous extension T4NOS T4 D 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
- For CS Extension codes 150-180, the T category for AJCC 7 staging is assigned based on the values of tumor basal diameter, recorded in CS Site-Specific Factor 2, and thickness, recorded in CS Site-Specific Factor 3. Basal diameter and thickness are mapped to Tumor Size Categories in the Tumor Size Category AJCC 7 Table, and the CS Extension codes and Tumor Size Categories are mapped to T in the Extension Size Category AJCC 7 Table. - For CS Extension codes 150-180, 635, and 640, the T category for AJCC 6 staging is assigned based on the values of tumor basal diameter, recorded in CS Site-Specific Factor 2, and thickness, recorded in CS Site-Specific Factor 3. Basal diameter and thickness are mapped to tumor size pairs in the Tumor Size Pair AJCC 6 Table, and the CS Extension codes and tumor size pairs are mapped to T in the Extension Size Pair AJCC 6 Table.