"They are usually classified as TI-RADS 2 nodules and routine follow up is enough in most of the cases. No fine-needle aspiration (FNA) is required, except if very large, however reaccumulation is observed in half of the cases. Radiofrequency ablation, ethanol ablation or surgical removal can also be done for very large or symptomatic cysts 5."
"smooth wall, anechoic or hypoechoic"