The histories of 358 patients with carcinomas of the thyroid have been evaluated. Differentiated carcinomas of the thyroid (84.6%) were treated by means of thyroidectomy, ablative radio-iodine therapy (tissue dose 1000 Gray), TSH-suppressive thyroid hormone medication and, in special cases, external radiation. Even differentiated carcinomas showed a high recurrence rate. Metastases occurred particularly in the lungs, the skeleton and locally; low iodine uptake, particularly in distant metastases from papillary carcinomas, often made it impossible to reach a diagnosis by using radio-iodine. Some pulmonary metastases could only be demonstrated radiologically and some skeletal metastases could be shown radiologically or scintigraphically. A modified follow-up program for differentiated carcinomas is suggested, based on the highly sensitive and specific thyroglobulin determination under TSH suppression (sensitivity 97.9%, specificity 93.6%).
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