I just had an ultrasound that showed a very large ( 5.4 X 2.4 X 4.1 cm) cystic lesion of the thyroid. The report said it may be a degenerating adenoma but a chronic neoplasm can't be ruled out. My TSH is low. My free serum Triiodothyronie is high, free T4 is normal, and Thyroid Peroxidase is 23 with the range being 0 - 34.
I really don't understand this, and can't seem to find much information to explain it. Any thoughts?