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A type of transient congenital hypothyroidism a thyroid hormone deficiency that is not permanent. Patients may present with symptoms similar to those of permanent congenital hypothyroidism or they may be asymptomatic. It is caused by the transfer of maternal thyroid stimulating hormone (TSH) blocking antibodies, which can block the TSH receptor in the neonatal thyroid resulting in hypothyroidism in the infant. The effect can last up to 3-6 months after birth as maternal antibody levels fall. Treatment with l-thyroxine is usually required during this period.
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