[2-isotope study in the diagnosis of thyroid cancer]

Altogether 54 patients with thyroid nodal lesions (40 of them had thyroid carcinoma) were investigated by 75Se-methionine and a thyrotropic RP. 75Se-methionine turned out to be inappropriate for differential diagnosis of benign and malignant thyroid lesions because of many false-negative results. The combination of positive scanning with 75Se-methionine and 99mTc-pertechnetate (or 131I) raised the diagnostic informative value of the method.