EYE, CHOROID (67693)    ICDO TOPOGRAPHY (164)

Primary Tumor (T)
      an elevation more than 3 mm but not more than 5 mm
T3* Tumor more than 15 mm in greatest dimension or
       with an elevation more than 5 mm
T4  Tumor with extraocular extension

Note: When dimension and elevation show a difference in classification, the
highest category should be used for classification.
*Note: In clinical practice the tumor base may be estimated in optic disc
diameters (dd) (average: 1 dd = 1.5 mm).  The elevation may be estimated in
diopters (average: 3 diopters = 1 mm).  Other techniques used, such as

ultrasonography and computerized stereometry, may provide a more accurate
measurement.
TX  Primary tumor cannot be assessed
T0  No evidence of primary tumor
T1* Tumor 10 mm or less in greatest dimension with an elevation 3 mm or less
T1a Tumor 7 mm or less in greatest dimension with an elevation 2 mm or less
T1b Tumor more than 7 mm but not more than 10 mm in greatest dimension with
      an elevation more than 2 mm but not more than 3 mm
T2* Tumor more than 10 mm but not more than 15 mm in greatest dimension with

Regional Lymph Nodes (N)

NX  Regional lymph nodes cannot be assessed
N0  No regional lymph node metastasis
N1  Regional lymph node metastasis

• DESCRIPTION:   CBA
  CODE:   TX
• DESCRIPTION:   10-16mm in dia/2.5-10mm in height w macro extra
  CODE:   T2c
• DESCRIPTION:   > 16mm in dia/> 10mm in height w/o extraocular
  CODE:   T3
• DESCRIPTION:   > 16mm in dia/> 10mm in height w extraocular
  CODE:   T4
• DESCRIPTION:   NA
  CODE:   NA
• DESCRIPTION:   NET
  CODE:   T0
• DESCRIPTION:   10mm in dia/2.5mm in height
  CODE:   T1
• DESCRIPTION:   10mm in dia/2.5mm in height w/o micro extraocular
  CODE:   T1a
• DESCRIPTION:   10mm in dia/2.5mm in height w micro extraocular
  CODE:   T1b
• DESCRIPTION:   10mm in dia/2.5mm in height w macro extraocular
  CODE:   T1c
• DESCRIPTION:   10-16mm in dia/2.5-10mm in height
  CODE:   T2
• DESCRIPTION:   10-16mm in dia/2.5-10mm in height w/o micro extra
  CODE:   T2a
• DESCRIPTION:   10-16mm in dia/2.5-10mm in height w micro extra
  CODE:   T2b

Primary Tumor (T)
T1b  Tumor 10 mm or less in greatest dimension and 2.5 mm or less in greatest
       height (thickness) with microscopic extraocular extension
T1c  Tumor 10 mm or less in greatest dimension and 2.5 mm or less in greatest
       height (thickness) with macroscopic extraocular extension
T2   Tumor greater than 10 mm but not more than 16 mm in greatest basal
       diameter and between 2.5 and 10 mm in maximum height (thickness)
T2a  Tumor 10 mm to 16 mm in greatest basal diameter and between 2.5 and 10 mm
       in maximum height (thickness) without microscopic extraocular extension
T2b  Tumor 10 mm to 16 mm in greatest basal diameter and between 2.5 and 10 mm
       in maximum height (thickness) with microscopic extraocular extension
Choroid
T2c  Tumor 10 mm to 16 mm in greatest basal diameter and between 2.5 and 10 mm
       in maximum height (thickness) with macroscopic extraocular extension
T3   Tumor more than 16 mm in greatest diameter and/or greater than 10 mm in
       maximum height (thickness) without extraocular extension
T4   Tumor more than 16 mm in greatest diameter and/or greater than 10 mm in
        maximum height (thickness) with extraocular extension

TX   Primary tumor cannot be assessed
T0   No evidence of primary tumor
T1   Tumor 10 mm or less in greatest dimension and 2.5 mm or less in greatest
       height (thickness)
T1a  Tumor 10 mm or less in greatest dimension and 2.5 mm or less in greatest
        height (thickness) without microscopic extraocular extension

• CHOROID

• CBA
  CODE:   TX
  ACOS CODE:   TX
• > 15 mm/> 5 mm elevation
  CODE:   T3
  ACOS CODE:   T3
• Extraocular extension
  CODE:   T4
  ACOS CODE:   T4
• NA
  CODE:   NA
  ACOS CODE:   NA
• NET
  CODE:   T0
  ACOS CODE:   T0
• <= 10 mm/<= 3 mm elevation
  CODE:   T1
  ACOS CODE:   T1
• <= 7mm/<= 2 mm elevation
  CODE:   T1a
  ACOS CODE:   T1A
• > 7 mm, <= 10 mm/> 2 mm, <= 3 mm elevation
  CODE:   T1b
  ACOS CODE:   T1B
• > 10 mm, <=15 mm/3-5 mm elevation
  CODE:   T2
  ACOS CODE:   T2

• NCA
  CODE:   NX
  ACOS CODE:   NX
• NRN
  CODE:   N0
  ACOS CODE:   N0
• Regional lymph node metastasis
  CODE:   N1
  ACOS CODE:   N1
• NA
  CODE:   NA
  ACOS CODE:   NA