Autoimmune Thyroiditis Shifting from Hashimoto's Thyroiditis to Graves' Disease

• Published in: Medicina (Kaunas, Lithuania) Vol. 59; no. 4; p. 757
• Main Authors: Daramjav, Narantsatsral, Takagi, Junko, Iwayama, Hideyuki, Uchino, Kaori, Inukai, Daisuke, Otake, Kazuo, Ogawa, Tetsuya, Takami, Akiyoshi
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 13-04-2023; MDPI
• Subjects: Adult; Aged; Aged, 80 and over; Antibodies; autoimmune disease; Case Report; Case studies; Cytokines; Development and progression; Diagnosis; Drugs; Family medical history; Female; Graves disease; Graves Disease - complications; Graves Disease - drug therapy; Hashimoto Disease - complications; Hashimoto Disease - diagnosis; Hashimoto Disease - drug therapy; Hashimoto thyroiditis; Hormone replacement therapy; Humans; Hyperthyroidism; Hypothyroidism; Iatrogenesis; Male; Middle Aged; Neutropenia; Pathology; Patients; thyroid antibodies; Thyroid gland; Thyroidectomy; Thyroiditis, Autoimmune; Young Adult; Japan; United States > US; thyroid antibodies; Graves’ disease; autoimmune disease; Hashimoto thyroiditis
• ISSN: 1648-9144; 1010-660X; 1648-9144
• DOI: 10.3390/medicina59040757

In 15-20% of cases, Graves' disease (GD) shifts to Hashimoto's thyroiditis (HT), while the shift from HT to GD is rare. We present a case of a patient in whom HT shifted to GD, along with a literature review. A 50-year-old woman with myxedema was diagnosed with Hashimoto's disease due to hypothyroidism and the presence of antibodies against thyroid peroxidase (TPOAb) and thyroglobulin (TgAb); she also had thyroid stimulating antibodies (TSAb) without any signs of GD. Although thyroid hormone replacement therapy improved her thyroid function, 2 months later, hyperthyroidism appeared and did not improve after discontinuation of the replacement therapy. The patient was diagnosed with GD, which improved with antithyroid agent administration. To date, only 50 cases regarding conversion from HT to GD have been reported. The median age is 44 years (range, 23-82 years), and the median time of conversion is 7 years (range, 0.1-27 years). The male-to-female ratio of HT conversion to GD is 1:9, closer to that of regular GD (1:10) than that of general HT (1:18). All patients received thyroid hormone replacement therapy for hypothyroidism due to HT. Continuous evaluation of TSAb levels is recommended in HT, particularly in cases of TSAb-positive and those under replacement, since it may help predict conversion to GD. Evaluating the clinical characteristics of patients with HT preceding GD is crucial to ensure appropriate treatment and reduce the risk of adverse events.