Fine Needle Aspiration Biopsy
Also written as: FNAB — Fine Needle Aspiration Biopsy
A minimally invasive procedure to obtain cellular samples from thyroid nodules for cytological examination.
Full Definition
Fine needle aspiration biopsy (FNAB or FNA) is the gold standard initial diagnostic procedure for evaluating thyroid nodules. The procedure involves inserting a thin needle (typically 25-27 gauge) into the nodule to aspirate cells for cytological analysis. Results are typically reported using the Bethesda System for Reporting Thyroid Cytopathology, which categorizes findings from benign to malignant. FNAB is performed under ultrasound guidance to ensure accurate sampling and can be repeated if initial samples are inadequate. The procedure has high sensitivity and specificity for detecting thyroid malignancy.
Usage
Usage note: May be abbreviated as FNA or FNAB; ensure consistency within documents.
In Context
- "Fine needle aspiration biopsy revealed suspicious cytology requiring surgical consultation." — Pathology report
- "Ultrasound-guided FNAB was performed on the dominant right thyroid nodule." — Procedure note