You need to talk to your doctor and see if you can get a referral to see an Endocronologist (thyroid specialist) they will determine if you need a ultrasound, biopsy, etc. Some nodules are ok and some aren't usually they can tell by doing an ultrasound, not sure what they can see on an MRI.
Keep us posted on how you are doing.
Trust in the Lord with all thine heart, and lean not unto thine own understanding ~ Proverbs 3:5 ~
DX: Lupus, Sjogrens, Raynaud's, Hashimoto's and Celiac Disease
RX: Imuran, Plaquenil, Methotrexate, Flexeril, Piroxicam, Levoxyl, Folic Acid, Folgard OS (B12), Vitamin D-50,000 IU, Tramadol (as needed) and magic mouthwash (for mouth sores)