Earlier this week I had a CT scan of my heart to check for PV stenosis (I had an ablation done for a-fib).My EP called and told me the scan showed my thyroid was enlarged and I should follow up with my primary care doctor and have an ultra sound done. My question is: In April 07 I had a neck CT done because of a clicking in my throat. The ENT told me the CT showed no tumors or anything and my thyroid was fine. Now a year later I am being told my thyroid is enlarged. What could be the cause? I had a scan done in January right before my ablation and nothing was noted about my thyroid then. What are the chances of this being cancer? Thank you in advance for your help.