The calculator in question is the TNM Classification for Parathyroid Carcinoma, as defined by the American Joint Committee on Cancer (AJCC). This scoring system is specifically used for patients diagnosed with parathyroid carcinoma, a rare type of endocrine cancer. The TNM classification is a globally recognized standard for staging different types of cancer, where T stands for Tumor size, N for lymph Node involvement, and M for Metastasis. 

In the context of parathyroid carcinoma, this calculator helps in determining the extent of the disease, which is crucial for planning treatment and predicting prognosis. It takes into account factors such as the size of the primary tumor, whether the cancer has spread to nearby lymph nodes, and whether it has metastasized to other parts of the body.

There are no specific exclusion criteria for the use of the TNM Classification for Parathyroid Carcinoma. However, it is not applicable to other types of parathyroid diseases or other forms of cancer. It is also important to note that the accuracy of this staging system depends on the thoroughness of the clinical and pathological evaluation.

TNM classification for parathyroid carcinoma (AJCC)

# Description:
The calculator in question is the TNM Classification for Parathyroid Carcinoma, as defined by the American Joint Committee on Cancer (AJCC). This scoring system is specifically used for patients diagnosed with parathyroid carcinoma, a rare type of endocrine cancer. The TNM classification is a globally recognized standard for staging different types of cancer, where T stands for Tumor size, N for lymph Node involvement, and M for Metastasis. 

In the context of parathyroid carcinoma, this calculator helps in determining the extent of the disease, which is crucial for planning treatment and predicting prognosis. It takes into account factors such as the size of the primary tumor, whether the cancer has spread to nearby lymph nodes, and whether it has metastasized to other parts of the body.

There are no specific exclusion criteria for the use of the TNM Classification for Parathyroid Carcinoma. However, it is not applicable to other types of parathyroid diseases or other forms of cancer. It is also important to note that the accuracy of this staging system depends on the thoroughness of the clinical and pathological evaluation.
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# Inputs:
## Tumor classification
A. Tx: Primary tumor cannot be assessed
B. T0: No evidence of primary tumor
C. Tis: Atypical parathyroid neoplasm (neoplasm of uncertain malignant potential)
D. T1: Localized to the parathyroid gland with extension limited to soft tissue
E. T2: Direct invasion into the thyroid gland
F. T3: Direct invasion into the recurrent laryngeal nerve, esophagus, trachea, skeletal muscle, adjacent lymph nodes, or thymus
G. T4: Direct invasion into major blood vessels or spine

## Lymph node classification
H. Nx: Regional lymph nodes cannot be assessed
I. N0: No regional lymph node metastasis
J. N1a: Metastasis to level VI (pretracheal, paratracheal, and prelaryngeal/Delphian lymph nodes) or superior mediastinal lymph nodes (level VII)
K. N1b: Metastasis to unilateral, bilateral, or contralateral cervical (level I, II, III, IV, or V) or retropharyngeal nodes

## Metastasis classification
L. M0: No distant metastasis
M. M1: Distant metastasis present
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# Scoring:
- If (A or B or C or D or E or F or G) and (H or I or J or K) and (L or M), then The AJCC does not provide anatomic stage and prognostic groups for parathyroid carcinoma due to insufficient data
- If true, then The AJCC does not provide anatomic stage and prognostic groups for parathyroid carcinoma due to insufficient data.)