Because normal thyroid tissue is spared, cats do not typically require thyroid hormone supplementation. (felinehtc.com)
When hyperactive thyroid tissue develops, normal thyroid tissue atrophies because thyroid hormone production by the abnormal tissue is excessive. (fvsec.com)
The antithyroid medications may increase the uptake of radioiodine inito the normal thyroid tissue and increase the possibility of hypothyroidism after therapy. (felinehtc.com)