One case of fetal and neonatal variable thyroid dysfunction in the context of Graves' disease.

Cases of maternal thyroid dysfunction are not always clearly identified during pregnancy. We report here the case of a 36-year-old patient with a history of treated Graves' disease whose child successively presented with a hypo- and hyperthyroid dysfunction that was difficult to treat despite the administration of synthetic antithyroid drugs and beta-blockers. The patient's thyroid hormone levels were normal during pregnancy, while still secreting anti-TSH-receptor autoantibodies. With time, these antibodies went from an inhibiting to a stimulating activity. Fetal monitoring using only ultrasonography had been proposed to the patient. With such a follow-up associated with fetal blood sampling it would have been possible to treat already in utero the thyroid dysfunction. The management of such patients is not limited to the follow-up of the maternal thyroid hormones, but should also evaluate the activity of the anti-TSH-receptor autoantibodies around the 28th week of amenorrhea and their effect on fetal blood. Fetal and neonatal thyroid dysfunctions have a major impact, but they can be detected and treated in utero. The clinical, laboratory and ultrasound follow-up makes it possible to monitor patients who are at risk and to propose a therapeutic and obstetrical management.