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Uptake of Thallium-201 in Enlarged Thyroid Glands: Concise Communication

Hyogo College of Medicine, Nishinomiya, Hyogo, Japan

Correspondence: For reprints contact: Minoru Fukuchi, Div. of Nuclear Medicine, RI Centre, Hyogo College of Medicine, Mukogawa, Nishinomiya City, Hygo 663, Japan.

ABSTRACT

We have investigated the thyroid uptake of Tl-201 in 37 patients with various types of goiter, and in six with normal thyroids. Significant thallium uptake was found in all cases in which there was thyroid enlargement, including Graves' disease, toxic thyroid nodule, primary hypothyroidism, simple goiter, Hashimoto's disease, thyroid carcinoma, and thyroid adenoma. If goiter was absent, however, there was no demonstrable uptake—e.g., in secondary hypothyroidism, subacute thyroiditis, and the normal controls. Thallium uptake did not correlate with thyroid function tests such as BMR, T₃-RU, T₃, T₄, TSH, antithyroid antibodies, or the 24-hr I-131 uptake. In 23 patients with diffuse goiter, on the other hand, maximum Tl-201 uptake correlated well with thyroid weight: r = 0.836 (p < 0.001); y = 0.02 x + 0.06.