BTA Classification (RCPath Thy System) Flashcards

A set of practice vocabulary flashcards covering the BTA classification (RCPath Thy System) for thyroid cytology, including risk percentages and management steps.

RCPath Thy System

The BTA classification system used for thyroid cytological diagnosis and management.

Thy1

The diagnostic category for a non-diagnostic result, with a malignancy risk of $0-10\,\%$.Management includes US assessment with or without a repeat FNAB.

Thy2

The diagnostic category for a non-neoplastic result, with a malignancy risk of $0-3\,\%$.Management involves correlating with clinical and US findings.

Thy3

The diagnostic category indicating that a neoplasm is possible.

Thy3a

A sub-category representing 'Atypia (uncategorized)'; management includes further US and potentially a repeat FNAB.

Thy3f

A sub-category for 'Atypia (possible follicular neoplasm)' with a malignancy risk of $15-30\,\%$. Management is a diagnostic hemithyroidectomy.

Thy4

The diagnostic category for a sample suspicious of malignancy, with a malignancy risk of $60-75\,\%$. Management is a diagnostic hemithyroidectomy.

Thy5

The diagnostic category for a result diagnostic of malignancy, with a malignancy risk of $94-99\,\%$. Management is surgical resection.

Non-diagnostic

The cytological diagnosis associated with the Thy1 category.

Non-neoplastic

The cytological diagnosis associated with the Thy2 category.

FNAB

Fine Needle Aspiration Biopsy, used in the assessment and repeat testing of thyroid nodules.

Atypia (uncategorized)

The specific description for the Thy3a cytological diagnosis.

Possible follicular neoplasm

The specific description for the Thy3f cytological diagnosis.

Suspicious of malignancy

The cytological diagnosis associated with the Thy4 category.

Diagnostic of malignancy

The cytological diagnosis associated with the Thy5 category.

Thy1 Malignancy Risk

The estimated risk of malignancy for non-diagnostic results is $0-10\,\%$.

Thy2 Malignancy Risk

The estimated risk of malignancy for non-neoplastic results is $0-3\,\%$.

Thy3f Malignancy Risk

The estimated risk of malignancy for a possible follicular neoplasm is $15-30\,\%$.

Thy4 Malignancy Risk

The estimated risk of malignancy for samples suspicious of malignancy is $60-75\,\%$.

Thy5 Malignancy Risk

The estimated risk of malignancy for samples diagnostic of malignancy is $94-99\,\%$.