FRI466 Toxic Retrosternal Goiter Following SARS-CoV-2 Vaccination

Disclosure: J. Schipper: None. Z. Abdul Sater: None. Since the outbreak of the SARS-CoV-2 pandemic, there have been reports of autoimmune thyroid diseases related to COVID inflection and SARS-CoV-2 vaccination. We report a case of SARS-CoV-2 mRNA vaccination (mCoVvax)-induced Graves with retrosternal extension. A 21-year-old Hispanic male with no previous history of thyroid illness presented with a 4-month history of tachycardia, tremors, agitation, unintentional weight loss, night sweats, low-grade fever, and orthopnea that developed 62 days after receiving the first dose of mCoVvax. His physical examination was significant for sinus tachycardia, hypertension, a resting tremor, brisk deep tendon reflexes, and diffuse nonpruritic maculopapular rash. His thyroid gland was diffusely enlarged with an unpalpable lower margin and positive Pemberton sign. TSH was undetectable with elevated Free T4 and Total T3 [11.0 (NL 0.8-1.8 ng/dL) and 800 (76-181 ng/dL), respectively]. Thyroid-stimulating immunoglobulin (TSI) was 337% (NL<140%), and thyroid peroxidase antibody was 653 IU/mL (NL < 9 IU/mL). Thyroid ultrasound showed a diffusely enlarged thyroid gland with diffusely increased thyroid uptake on technetium thyroid scan (95% and 85% uptake after 6 and 24 hrs, respectively), consistent with Graves’ disease. CT scan of the neck and chest confirmed retrosternal Goiter without tracheal deviation. He was treated with high-dose of Methimazole, Atenolol, and Prednisone. A literature search revealed five cases of Graves’ disease after mCOVvax, all of which did not have a retrosternal extension of the thyroid. Our case represents a rare complication of mCoVvax. Clinicians should consider retrosternal goiter in patients with thyrotoxicosis and orthopnea after mCoVvax exposure. Presentation: Friday, June 16, 2023