18F-FDG PET/CT correctly detected foci of thyroid carcinoma in TSH-Tg subgroups: Tg < 2 ng/ml – 8/24 patients (33 %), 2 ng/ml < Tg < 10 ng/ml – 9/29 patients (31 %), 10 ng/ml < Tg < 100 ng/ml - 19/42 patients (45 %), and 100 ng/ml < Tg - 11/14 patients (79 %). The gene discussed is TG; the disease is thyroid gland carcinoma.