Autonomous functioning thyroid nodules and 131I in diagnosis and therapy after 50 years of experience: What is still open to debate?

Giuseppe Ronga, Mauro Filesi, Rosaria D'Apollo, Maria Toteda, Angelo Domenico Di Nicola, Marzia Colandrea, Laura Travascio, Anna Rita Vestri, Teresa Montesano

Research output: Contribution to journalArticlepeer-review


PURPOSE OF THE REPORT: Autonomous functioning thyroid nodules (AFTN), defined as "hot nodules" at thyroid scan, are often cured by radioiodine treatment. The aim of our study was to investigate the long-term outcome in patients treated with an I calculated dose, to identify a possible "size-tailored" dose, and to simplify follow-up procedures. PATIENTS AND METHODS: Retrospective analysis was carried out on 1402 cases, covering a period of 50 years, of AFTN treated with an I calculated dose. Our study focused on nodular size and mean administered dose. Concordance between thyroid scan and serum TSH levels at 3-6 months from treatment was considered. RESULTS: A single I dose was effective for the vast majority of patients (93%). The outcome was influenced by nodular size. On the basis of the Italian dose limit for outpatient treatment, our population was divided into subgroups according to administered doses (more or less than 16 mCi) and nodular dimensions: no differences in outcome were observed for each class of nodule size. A dose ≤10 mCi was effective on the smaller nodules (50.1% of our population). The agreement between TSH and scan after treatment was 90.3% at 3 months and 94.5% at 6 months. CONCLUSIONS: I therapy with a calculated dose is an effective treatment of AFTN. If a fixed dose is chosen, 16 mCi is often resolutive and for nodules 5 cm are eligible for surgery. TSH is the only parameter required to evaluate the outcome.

Original languageEnglish
Pages (from-to)349-353
Number of pages5
JournalClinical Nuclear Medicine
Issue number5
Publication statusPublished - May 2013


  • 131I therapy
  • AFTN
  • hyperthyroidism
  • thyroid hot nodule
  • thyroid scan

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging


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