Papillary thyroid carcinoma and subclinical thyrotoxicosis: Brief insight into the thyroid regulators other than thyroid stimulating hormone.

Papillary thyroid carcinoma (PTC) is the most common thyroid malignancy. It usually develops in euthyroid patients with history of long standing Hashimoto's thyroiditis. Here, we describe the development of PTC in a seronegative patient with subclinical thyrotoxicosis. We suggest that any cold nodule having high-risk features on ultrasonography in hyperthyroid patients should be thoroughly evaluated for the possibility of a thyroid malignancy and the possible role of nonthyroid stimulating hormone regulatory molecules, in thyroid carcinogenesis needs to be further explored.