[A comparative evaluation of radionuclide and ultrasonic studies of the thyroid].

Unlike radionuclide scanning (RNS) ultrasound investigation (USI) permits thyroid volume estimation in hyperplasia and euthyroid goiter. USI in nodular goiter gives an opportunity to reveal the sizes of a tumor, its macrostructure, topographic position with regard to the neck organs and vessels and is a method of choice in autoimmune thyroiditis. A considerable advantage of USI is a possibility to characterize the thyroid collateral lobe in toxic adenoma and to perform investigations over time. A positive feature of RNS is a possibility for differential diagnosis of "hot" and "cold" nodes of the thyroid, metastases to other organs and atypical localization of the gland.