Objective: Conventional fine-needle aspiration biopsy (FNAB) for cystic thyroid nodules (CTNs) has a high rate of nondiagnostic and false-negative results. Ultrasound-guided FNAB (UG-FNAB ...

but it gives more information about how your thyroid is working. Ultrasound. You'll get this test, which uses sound waves to make a picture of things inside your body, to learn more about nodules ...