Brief Answer: Most likely multinodular goiter requiring thyroid function tests and FNAC (fine needle aspiration cytology) or biopsy. Detailed Answer: Warm Welcome. I appreciate your trust in HCM and assure you are on best portal on the globe for expert online medical services. I have thoroughly reviewed health query you raised, and well realize all of those concerns. Being your physician, I will take care all of them today and will extend my expertise to solve the problems. Based on your report, you are most likely having multinodular goiter. You haven t told how you were diagnosed with Hashimoto s thyroiditis but as the sizes of nodules are enlarged enough for biopsy, following should be the approach by by your treating physician. Two things are needed to be determined in your case: • Whether this goiter is toxic or non-toxic based on their hormone producing activity. • Whether this goiter is benign or has any cancerous changes. There is about 15% chance to be malignant. You are advised to do thyroid function test and a FNAC (fine needle aspiration cytology) or biopsy based on your physician s preference to determine above points I mentioned. Once the definitive diagnosis is made based on tests, a detailed treatment plan will be devised for you which also include surgery. Hope I addressed all the concerns you have. Let me know if you have further questions. I will be more than happy to clear any doubts. Keep a follow up to see how you doing. Regards! Dr. Ali Raza