I had the left half of the thyroid removed in 2005 and now they have found toxic multinodular goiter with the largest nodule having internal vascularity noted in my right half of the thyroid. TSH leve was .02 before being placed on Methemazole 7.5 mg. In 2012 they also found multiple nodules in both lungs. I have a history of Supraventricular Tachycardia. What are the chances of having cancer?
Thanks for your question on Chat Doctor. In my opinion you should first get done biopsy of the thyroid nodule (largest). Recurrent thyroid nodules and multiple lung nodules indicate cancer mostly. So for tissue diagnosis biopsy and histopathological examination is must. Thyroid cancers especially papillary cancer is notorious in lung spread and causing hyperthyroidism.  So your supra ventricular tachycardia can be due to this only. So first get done the diagnosis by biopsy than start treatment accordingly.