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Context: The aims of the study are to compare characteristics of subacute thyroiditis (SAT) related to different etiologies, and to identify predictors of recurrence of SAT and incident hypothyroidism. Methods: This nationwide, multicenter, retrospective cohort study included 53 endocrinology centers in Turkey. The study participants were divided into either COVID-19–related SAT (Cov-SAT), SARS-CoV-2 vaccine–related SAT (Vac-SAT), or control SAT (Cont-SAT) groups. Results: Of the 811 patients, 258 (31.8%) were included in the Vac-SAT group, 98 (12.1%) in the Cov-SAT group, and 455 (56.1%) in the Cont-SAT group. No difference was found between the groups with regard to laboratory and imaging findings. SAT etiology was not an independent predictor of recurrence or hypothyroidism. In the entire cohort, steroid therapy requirement and younger age were statistically significant predictors for SAT recurrence. C-reactive protein measured during SAT onset, female sex, absence of antithyroid peroxidase (TPO) positivity, and absence of steroid therapy were statistically significant predictors of incident (early) hypothyroidism, irrespective of SAT etiology. On the other hand, probable predictors of established hypothyroidism differed from that of incident hypothyroidism. Conclusion: Since there is no difference in terms of follow-up parameters and outcomes, COVID-19– and SARS-CoV-2 vaccine–related SAT can be treated and followed up like classic SATs. Recurrence was determined by younger age and steroid therapy requirement. Steroid therapy independently predicts incident hypothyroidism that may sometimes be transient in overall SAT and is also associated with a lower risk of established hypothyroidism. [ABSTRACT FROM AUTHOR]

Riedel's thyroiditis is a rare variant of thyroiditis, and treatment recommendations are based on case reports. This thyroiditis form is considered among immunoglobulin G4-related diseases. Intense fibrosis of the thyroid gland can cause compression of the surrounding tissues and hypothyroidism. Glucocorticoids are recommended as first-line therapy, and tamoxifen is second-line therapy. Other immunosuppressive agents have also been used in some resistant cases. Our case was presented with a palpable firm mass in the neck, shortness of breath, and hypothyroidism. The exact diagnosis of Riedel's thyroiditis was made after a pathological examination of a true-cut biopsy. We present the successful management of this case with glucocorticoid and tamoxifen combination treatment. [ABSTRACT FROM AUTHOR]

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