Do stylet needles improve diagnostic accuracy in thyroid fine-needle aspiration? A retrospective analysis

Area of Science:

• Endocrinology
• Surgical Pathology
• Diagnostic Cytopathology

Background:

• Thyroid fine needle aspiration (FNA) is a key diagnostic tool.
• Stylet needles are hypothesized to improve specimen adequacy by reducing blood contamination compared to syringe needles.
• The higher cost of stylet needles necessitates evidence of improved outcomes.

Purpose of the Study:

• To compare the efficacy of stylet needles versus traditional syringe needles in thyroid FNA.
• To evaluate differences in specimen adequacy and diagnostic yield between the two needle types.
• To assess the cost-effectiveness implications of stylet needle use.

Main Methods:

• Retrospective analysis of 4793 thyroid FNA procedures.
• Comparison of outcomes between procedures using stylet needles (n=2088) and syringe needles (n=2705).
• Evaluation of primary outcome (specimen adequacy) and secondary outcomes (sensitivity, specificity, diagnostic accuracy, PPV, NPV).

Main Results:

• No statistically significant differences were observed in specimen adequacy between stylet (85.34%) and syringe needles (87.13%).
• Diagnostic performance metrics including sensitivity, specificity, accuracy, PPV, and NPV were comparable for both needle types.
• Performance metrics remained similar across individual operators for both needle types.

Conclusions:

• Stylet needles do not provide a significant benefit over syringe needles for thyroid FNA in terms of specimen adequacy.
• The diagnostic yield of thyroid FNA is not improved by using stylet needles compared to syringe needles.
• The findings suggest that traditional syringe needles are a cost-effective option for thyroid FNA.