Fine-needle aspiration biopsy of the thyroid nodule is a procedure in which a small sample of cells is obtained from a thyroid nodule with the aid of a thin needle under ultrasound guidance.

Endoscopic ultrasound-guided fine needle aspiration biopsy (EUS-FNA ... Moreover, even minute lesions down to a size of 5 mm may be imaged and consequently biopsied. This Review describes the ...

However, the ultrasonic control of the needle during biopsy is more difficult with standard needle systems due to a size difference between the needle sheath and the working channel. There is a ...