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Tc‐99m Pertechnetate Trapping and Thyroid Function in Hashimoto's Thyroiditis

Tc-99m pertechnetate thyroid Imaging was studied in 52 patients with Hashimoto's thyrolditis, with special reference to the thyroid functional state and Tc-99m trapping by the gland. The most common finding was diffusely increased trapping of radioactivity, a pattern similar to Graves' disease. On the other hand, the increased trapping in Hashimoto's thyroiditis was usually associated with hypothyroidism. The degree of Tc-99m trapping did not correlate with the degree of the endogenous TSH elevation. However, Increased Tc-99m trapping could predict the reversibility of hypothyroldism in just 3 months.