A diffusely enlarged thyroid gland associated with hyperthyroidism is known as Graves disease. At low power microscopically, note the prominent infoldings of the hyperplastic follicular epithelium. In this autoimmune disease the action of thyroid stimulating immunoglobulins (TSI's) predominates over that of thyroid growth immunoglobulins (TGI's).


What would the level of thyroid stimulating hormone be as a result of Graves disease?

A Low

B High