Endoscopic ultrasound-guided fine needle aspiration biopsy (EUS-FNA) is currently performed on a routine basis at many endoscopic centers and it is evident that this procedure has a major impact ...

the quality of the ultrasonic image. The final decision relies on a compromise between these options. A stiff steel needle for fine needle aspiration biopsy is the 'core' of this biopsy instrument.

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.