334 patients(female: 298, male: 36) who had clinically palpable thyroid nodules and were operated from March,1974 through June, 1980 were reviewed. All was taken thyroid scan using 99mTc-pertechnetate and was compared tohistopathological diagnosis. Solitary cold nodule was the most common finding of thyroid scan(255/334: 76.38%) and171 of them(67.06%) were adenoma an 44(13.17%) carcinoma. So 44 of 56 cancers was solitary cold nodule. Thefrequency of histopathological findings of thyroid nodules was as follow: 1. Adenoma 211(63.17%) 2. Cancer56(16.17%) 3. Adenomatous nodule 28(8.38%) 4. Cyst 18(5.39%) 5. Thyroiditis 16(4.79%) 6. Diffuse hyperthyroidism5(1.50%)