A long-standing theory in gastroenterology is that stem cells in the stomach arise in the isthmus, the region located around the middle of the corpus glands. These cells migrate to the tops and ...

The isthmus contained 6% of all nodules, the middle lobe 45.7%, the lower lobe 37.3% and the upper lobe 11%. Across all sections of the thyroid, there were 335 malignant nodules.