Abstract
ABSTRACT Objective: To report the case of a female patient with hypothyroidism who spontaneously developed Graves hyperthyroidism during pregnancy and then reverted back to hypothyroidism in a subsequent pregnancy. Methods: The pertinent clinical features, laboratory data, and clinical course of the case are reported, along with a brief literature review. Results: A 30-year-old female with hypothyroidism diagnosed at age 20 years unexpectedly required decreased levothyroxine dosing during her second pregnancy. She was taking levothyroxine 12.5 μg daily when she became pregnant a third time. In the first trimester, levothyroxine was discontinued, and she presented in the third trimester with clinical and biochemical hyperthyroidism and a diffusely enlarged goiter. Propylthiouracil (PTU) was initiated. Thyroid-stimulating hormone–receptor antibodies (TRAbs) were positive. After delivery, her baby developed transient neonatal Graves disease. She was continued on a stable dose of PTU for 10 months postpartum ...
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