Koyuncu, FMTamay, AGBugday, S2025-04-102025-04-100091-2751http://hdl.handle.net/20.500.14701/34648Fetal goiter can be the result of maternal hyperthyroidism treated with antithyroid drugs. Polyhydramnios may be the presenting symptom and can be diagnosed prenatally by sonography. We report a case of fetal goiter diagnosed at 30 weeks of gestation and fetal hypothyroidism confirmed by cordocentesis. Intra-amniotic levothyroxine was administered. Onset of preterm labor could not be prevented. The risks and benefits of intrauterine treatment of fetal goitrous hypothyroidism are discussed. (C) 2010 Wiley Periodicals, Inc. J Clin Ultrasound 38:503-505, 2010; Published online in Wiley Online Library (wileyonlinelibrary.com). DOI: 10.1002/jcu.20717EnglishArticle1097-0096