Prenatal Diagnosis of Fetal Hypothyroidism After Maternal Radioactive Iodine Exposure During Pregnancy

A 33-year-old woman with a history of surgically treated papillary thyroid carcinoma was inadvertently given radioactive iodine when she was 16 weeks pregnant. Sonographic examination revealed fetal thyroid hypoplasia, and cordocentesis confirmed fetal hypothyroidism at 22 weeks. The pregnancy was terminated at 24 weeks. We report the first case of fetal thyroid hypoplasia diagnosed by ultrasound and cordocentesis. (C) 2010 Wiley Periodicals, Inc. J Clin Ultrasound 38:506-508, 2010; Published online in Wiley Online Library (wileyonlinelibrary.com). DOI: 10.1002/jcu.2073