Histology: Hashimoto's thyroiditis

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  Thyroid Science 6(3):1-5, 2011

Development of Postpartum Graves’ Hyperthyroidism
in a Woman with Hashimoto’s Hypothyroidism

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Cindy Huang, MD, Diane Fresca, MD
Dragana Jokic, MD, and Xiangbing Wang, MD, PhD

Division of Endocrinology, Metabolism & Nutrition, Department of Medicine,
UMDNJ- Robert W ood Johnson Medical School, New Brunswick, NJ 08093-0019

Corresponding author: Xiangbing Wang, MD, PhD FACE
Division of Endocrinology, Metabolism & Nutrition
Robert W ood Johnson University Hospital-UMDNJ
MEB 384B, 1 RWJ Place, P.O.box 19. New Brunswick, NJ 08903
Phone (732) 235-7751 Fax (732) 235-7069 E-mail: wangx9@umdnj.edu

Abstract. Transformation of Hashimoto’s hypothyroidism to Graves’ hyperthyroidism is extremely rare, but does occur. The course and severity of autoimmune thyroid diseases are altered during pregnancy and the postpartum period. We report the clinical course, laboratory findings, and treatment of a female patient with Hashimoto hypothyroidism. She had a past medical history of Hashimoto hypothyroidism and had been on LT4 replacement therapy for two years. Six-months postpartum, however, she developed Graves’ hyperthyroidism. LT4 was discontinued, and the patient was started on methimazole, 30 mg daily. Methimazole was discontinued one month later due to severe side effects, and 131 radioiodine therapy was applied. We suggest that patients with preexisting Hashimoto’s hypothyroidism are not immune to developing Graves’ disease. When such patients have unexpected symptoms and changes in thyroid function tests, especially during pregnancy or in the postpartum state, this unlikely diagnosis should be entertained and treated accordingly.

• Autoimmune thyroid disease • Graves’ disease • Hashimoto’s • Hyperthyroidism • Hypothyroidism • LT4 • Methimazole

Citation: Huang, C., Fresca, D., Jokic, D., and Wang, X.: Development of Postpartum Graves’ Hyperthyroidism in a Woman with Hashimoto’s Hypothyroidism. Thyroid Science, 6(3):1-5, 2011.

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© 2011 Thyroid Science