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Fine-needle aspiration of the thyroid
D N Poller1, A K Ibrahim, M H Cummings
1Department of Pathology, Queen Alexandra Hospital, Cosham, Portsmouth, United Kingdom.
Cancer
|August 31, 2000
Summary
A new 5-category system for thyroid fine-needle aspiration (FNA) improves diagnostic accuracy. The indeterminate (THY3) category is clinically useful, reducing false-negative results for thyroid nodules.
Area of Science:
- Cytopathology
- Endocrinology
- Surgical Pathology
Background:
- Fine-needle aspiration (FNA) is crucial for preoperative thyroid lesion assessment.
- Diagnostic overlaps exist, especially for follicular neoplasms, necessitating improved classification.
- A 5-category working system was developed to enhance diagnostic clarity.
Purpose of the Study:
- To present and evaluate a 5-category working system for thyroid FNA diagnosis.
- To improve diagnostic efficacy and reduce false-negative rates in thyroid nodule evaluation.
- To provide clear diagnostic guidelines for thyroid FNA.
Main Methods:
- A prospective 2-year study evaluated 156 patients with nodular thyroid lesions.
- Thyroid FNA results were classified using a 5-category scheme (THY1-THY5).
- Patients were managed in a multidisciplinary thyroid clinic, with repeat aspirations and excisions as needed.
Main Results:
- Of 156 patients, 75 underwent excision, revealing various benign and neoplastic lesions.
- A significant difference was observed in neoplastic versus benign lesions between the indeterminate (THY3) and suspicious (THY4) categories (P=0.05).
- One false-positive (THY5) and no false-negative results were identified.
Conclusions:
- The proposed 5-category system, including an indeterminate (THY3) category, enhances thyroid FNA diagnostic efficacy.
- This system is clinically useful for managing thyroid nodules.
- The indeterminate category can significantly reduce or eliminate false-negative FNA results.