Thyroid stunning in clinical practice: Is it a real problem?

M. Filesi, M. Colandrea, T. Montesano, R. D'Apollo, G. Ronga

Research output: Contribution to journalArticlepeer-review


Stunning is a phenomenon of reducing 131I uptaking activity by residual or metastatic tissue during the follow-up of patients after total thyroidectomy for differentiated thyroid carcinoma. It was observed at whole body scintigraphy performed after therapeutic dose, administered for remnant ablation, in patients who were previously given a 131I dose for diagnostic purpose. This phenomenon could influence the efficacy of radioisotopic therapy, making it unsuccessful. Stunning was observed also in case of hyperthyroidism treated by fractionated doses of 131I. After a careful revision of literature, Authors report their last 10 years-experience about very few cases of supposed stunning, observed in oncological and hyperthyroidal patients who underwent diagnostic scan and radioiodine therapy. In case of differentiated thyroid carcinoma, we recommended a careful selection of patients who will be given ablative therapy using very low diagnostic doses and administering further therapeutic dose in a short time. In case of hyperthyroidism treatment, it is confirmed the opportunity of a single therapeutic dose with TSH value within the normal range. Because it was found out a very small number of cases in our wide population, we conclude that stunning is not influent in clinical practice, above all if "well- practice" diagnostic-therapeutical procedures are strictly observed.

Original languageEnglish
Pages (from-to)29-36
Number of pages8
JournalMinerva Endocrinologica
Issue number1
Publication statusPublished - Mar 2009


  • Physiology
  • Radiopharmaceuticals
  • Thyroid diseases
  • Thyroid neoplasms
  • Thyroidectomy

ASJC Scopus subject areas

  • Endocrinology, Diabetes and Metabolism
  • Internal Medicine
  • Endocrinology
  • Medicine(all)


Dive into the research topics of 'Thyroid stunning in clinical practice: Is it a real problem?'. Together they form a unique fingerprint.

Cite this