hypoechoic thyroid nodules

I have had thyroid nodules for years without problems.  Several months ago, I started having occasional episodes of choking when I was eating or drinking. (worse with drinking liquids)  I also noticed hoarseness.  I had an U/S which showed multiple hypoechoic nodules in both lobes of my thyroid.  Largest on the right is in the mid portion of the lobe and measures 1.5 x .9 x .9  cm.  There is also a hypoechoic nodule in the right lobe extending into the isthmus measuring 1.5 x .5 x .6 cm.   The largest mass (hypoechoic) in the left is either a bilobed mass or two adjacent masses with the overall size 2.2 cm in length and 1.2 x 1.5 cm in transverse cross-section.  I did follow-up with my endocrinologist and have a FNB scheduled in 2 weeks.  Are hypoechoic nodules more often malignant and what is the percentage rate for this?  Thanks so much!
Cathy, R.N.