Differentiation of Causes of Hyperthyroidism According to Pattern of Radionucleotide Uptake

Reduced uptake:

 • Thyroiditis

 • Exogenous thyroxine

 • Iodine loading

 • Ectopic thyroid hormone secretion (struma ovarii)

Generalized increased uptake:

 • Graves' disease

 • Excess thyroid-stimulating hormone stimulation

Focal increased uptake:

 • Toxic multinodular goiter

 • Hyperfunctioning adenoma



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