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Case report
Transient neonatal hypothyroidism secondary to postnatal maternal exposure to contrast medium
  1. Céline Themelin1,
  2. Charlotte Pierron1,
  3. Jean-Felix Calafat2 and
  4. Carine de Beaufort1,3
  1. 1 Pediatrics, Centre Hospitalier du Luxembourg, Luxembourg, Luxembourg
  2. 2 Radiology, Centre Hospitalier de Luxembourg, Luxembourg, Luxembourg
  3. 3 Pediatrics, Universitair Ziekenhuis Brussel, Brussel, Belgium
  1. Correspondence to Professor Carine de Beaufort; debeaufort.carine{at}


We report a preterm breastfed infant who developed a transient hypothyroidism after his lactating mother had a CT scan with iodinated contrast medium, despite the advised 24 hours’ pause in breast feeding. The aetiological assessment did not show any other cause for this hypothyroidism. Transient neonatal hypothyroidism after the use of topical iodine is well known, but it has not been described as a complication of intravenous contrast medium administration to a lactating mother. This case highlights the possibility of transient neonatal hypothyroidism secondary to contrast medium exposure to a lactating mother. When imaging is needed in the lactating mother, a longer break in breast feeding might be needed to prevent transient hypothyroidism in the preterm infant.

  • thyroid disease
  • neonatal health
  • radiology

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  • Contributors CT, CP and CdB have been responsible for the acquisition of the data, the analysis and interpretation of the data, and the reporting. J-FC has been responsible for the review of the interpretation and the reporting.

  • Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.

  • Competing interests None declared.

  • Patient consent for publication Parental/guardian consent obtained.

  • Provenance and peer review Not commissioned; externally peer reviewed.

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