[Occurrence of malignant lesions in patients referred to 131I therapy due to benign thyroid diseases].

Introduction: (131)I therapy should be performed after exclusion of any morphological pathology that needs surgery--usually malignancy or its suspicion. The aim of the study was to evaluate the range of this problem in patients considered for radioiodine therapy due to benign thyroid diseases.

Material And Methods: In 2000-2005 year 3663 patients with hyperthyreosis were referred to (131)I therapy.