Case Report

Subacute Thyroiditis Associated with COVID-19

Table 1

Available case reports on SAT associated with COVID-19.

CasePlaceGenderAgePresentationLaboratory findingsImaging studiesFollow-up

Ippolito et al. [5]ItalyFemale69Five days after the diagnosis of COVID-19 pneumonia, she presented with palpitations, insomnia, and agitation. She did not refer neck pain but was under pain killers.TSH: low; FT4 and FT3: high; anti-thyroglobulin antibodies (TgAb), anti-peroxidase antibodies (TPOAb), and anti-TSH receptor antibodies (TRAb): negative.Ultrasonography (US): enlarged hypoechoic thyroid with decreased vascularity. No uptake in the thyroid scan using Tc 99-m.She was given methimazole, but the thyrotoxicosis worsened. She was given steroids, and after 10 days, all laboratory findings and symptoms improved.
Brancatella et al. [4]ItalyFemale18Symptoms included fever, neck pain radiated to the jaw, and palpitations 15 days after a SARS-CoV-2-positive oropharyngeal swab.TSH: undetectable; FT4 and FT3: elevated; TgAb, TPOAb, TRAb, inflammatory markers, and white blood cell count: elevated.US: bilateral and diffuse hypoechoic areas.Symptoms improved within 1 week, and thyroid function and labs normalized in 40 days.
Ruggeri et al. [7]ItalyFemale43The patient developed neck pain, fatigue, tremors, and palpitation one month after the diagnosis of COVID-19.TSH: suppressed; FT4 and FT3: elevated; TgAb, TPOAb, and TRAb: undetectable.US: diffusely enlarged and hypoechogenic thyroid gland. Thyroid scintigraphy with 99mTc-perthecnetate showed markedly reduced uptake.The patient was treated with oral prednisone, and within 2 weeks, the inflammatory response normalized. Thyroid function tests recovered 4 weeks after steroid treatment.
Campos-Barrera et al.MexicoFemale37Severe neck pain (8/10) irradiating to the right jaw and ear as well as fatigue. She did not mention any clinical signs of hyperthyroidism.TSH: undetectable; FT4 and FT3: elevated; TgAb, TPOAb, and TRAb: undetectable; elevated ESR and CRP and anemia.Thyroid iodine scan showed no radioactive iodine uptake.One month after the diagnosis, the patient remained asymptomatic but her lab tests were still relevant for anemia, thrombocytopenia, high ESR, and low TSH (0.01 mUI/L).