The Bethesda System for Reporting Thyroid Cytopathology: a meta-analysis

Area of Science:

• Cytopathology
• Oncology
• Surgical Pathology

Background:

• The Bethesda System for Reporting Thyroid Cytopathology (TBSRTC) is a standardized system for thyroid fine-needle aspiration (FNA) interpretation.
• Accurate cytopathological diagnosis is crucial for guiding patient management and surgical decisions for thyroid nodules.

Purpose of the Study:

• To evaluate the diagnostic validity and reliability of the Bethesda System for Reporting Thyroid Cytopathology (TBSRTC) using a meta-analysis approach.
• To determine the sensitivity, specificity, and diagnostic accuracy of TBSRTC based on available histological follow-up data.

Main Methods:

• A meta-analysis was conducted on publications from January 1, 2008, to September 1, 2011, including studies with histological follow-up data for thyroid fine-needle aspirations.
• Diagnostic performance metrics (sensitivity, specificity, accuracy, PPV, NPV) were calculated, defining true positives and true negatives based on histopathological confirmation.
• The nondiagnostic category was excluded from statistical analysis.

Main Results:

• The study analyzed 25,445 thyroid FNAs, with 6,362 (25%) undergoing surgical excision for definitive diagnosis.
• The overall sensitivity, specificity, and diagnostic accuracy of TBSRTC were found to be 97%, 50.7%, and 68.8%, respectively.
• Low rates of false negatives (3%) and false positives (0.5%) were observed, with a negative predictive value of 96.3%.

Conclusions:

• The meta-analysis indicates that the Bethesda System for Reporting Thyroid Cytopathology (TBSRTC) exhibits high overall diagnostic accuracy.
• TBSRTC is confirmed as a valid and reliable system for reporting thyroid cytopathology, aiding in clinical decision-making.