The calculator in question is the TNM Classification for Ciliary Body and Choroid Melanoma. TNM stands for Tumor, Node, Metastasis, a system used for staging different types of cancer. This specific TNM classification is applicable to patients diagnosed with melanoma of the ciliary body and choroid, which are parts of the eye.

The clinical utility of this calculator is to stage the severity of the cancer, which is crucial for determining the most appropriate treatment plan and for predicting prognosis. The TNM classification takes into account the size and extent of the primary tumor (T), whether the cancer has spread to nearby lymph nodes (N), and the presence of distant metastasis (M).

There are no specific exclusion criteria for the use of the TNM Classification for Ciliary Body and Choroid Melanoma. However, it is not applicable to other types of eye cancer or to melanoma located in other parts of the body. It is also less useful in cases where complete information about the tumor, nodes, and metastasis is not available.

TNM classification for ciliary body and choroid melanoma

# Criteria
 ## Tumor classification
A. Tx: Primary tumor cannot be assessed
B. T0: No evidence of primary tumor
C. T1a: Tumor size category 1 without ciliary body involvement and extraocular extension
D. T1b: Tumor size category 1 with ciliary body involvement
E. T1c: Tumor size category 1 without ciliary body involvement but with extraocular extension <= 5 mm in largest diameter
F. T1d: Tumor size category 1 with ciliary body involvement and extraocular extension <= 5 mm in largest diameter
G. T2a: Tumor size category 2 without ciliary body involvement and extraocular extension
H. T2b: Tumor size category 2 with ciliary body involvement
I. T2c: Tumor size category 2 without ciliary body involvement but with extraocular extension <= 5 mm in largest diameter
J. T2d: Tumor size category 2 with ciliary body involvement and extraocular extension <= 5 mm in largest diameter
K. T3a: Tumor size category 3 without ciliary body involvement and extraocular extension
L. T3b: Tumor size category 3 with ciliary body involvement
M. T3c: Tumor size category 3 without ciliary body involvement but with extraocular extension <= 5 mm in largest diameter
N. T3d: Tumor size category 3 with ciliary body involvement and extraocular extension <= 5 mm in largest diameter
O. T4a: Tumor size category 4 without ciliary body involvement and extraocular extension
P. T4b: Tumor size category 4 with ciliary body involvement
Q. T4c: Tumor size category 4 without ciliary body involvement but with extraocular extension <= 5 mm in largest diameter
R. T4d: Tumor size category 4 with ciliary body involvement and extraocular extension <= 5 mm in largest diameter
S. T4e: Any tumor size category with extraocular extension > 5 mm in largest diameter
## Lymph node classification
T. Nx: Regional lymph nodes cannot be assessed
U. N0: No regional lymph node metastasis
V. N1a: Metastasis in >= 1 regional lymph nodes
W. N1b: No positive regional lymph nodes, but there are discrete tumor deposits in orbit that are not contiguous to the eye (choroidal and ciliary body)
## Metastasis classification
X. M0: No distant metastasis
Y. M1: Largest diameter of largest metastasis <= 3 cm
Z. M1b: Largest diameter of the largest metastasis 3.1-8 cm
AA. M1c: Largest diameter of the largest metastasis >= 8.1 cm

# Conditions
- C and U and X
- (D or E or F or G) and U and X
- (H or K) and U and X
- (I or J or L or M or O) and U and X
- (N or P or Q) and U and X
- (R or S) and U and X
- ((C or D or E or F or G or H or I or J or K or L or M or N or O or P or Q or R or S) and (V or W) and X) or ((C or D or E or F or G or H or I or J or K or L or M or N or O or P or Q or R or S) and (V or W) and (Y or Z or AA))
- true