Overview
Riedel's thyroiditis, also known as IgG4-related thyroiditis, is a rare inflammatory condition characterized by fibrosis and enlargement of the thyroid gland, often associated with systemic manifestations of IgG4-related disease 1.Diagnosis
Clinical presentation includes neck swelling, compressive symptoms, and sometimes fever or malaise 1.
Elevated serum IgG4 levels are indicative but not always present 1.
Histopathological examination showing dense lymphoplasmocytic infiltrate and fibrosis is crucial for diagnosis 1.
Imaging studies (ultrasound, CT) may reveal characteristic features of thyroid enlargement and heterogeneity 1.
Fine-needle aspiration biopsy often shows nonspecific findings; core biopsy may provide more diagnostic information 1.Management
Corticosteroids are typically first-line treatment, often initiating with prednisone at doses ranging from 0.5 to 1 mg/kg/day 1.
Immunosuppressive agents such as azathioprine or mycophenolate mofetil may be used adjunctively in cases refractory to corticosteroids 1.
Surgical intervention may be necessary in cases of severe compressive symptoms or suspected malignancy 1.Special Populations
Pregnancy: Limited data; management typically involves close monitoring and possibly dose adjustment of corticosteroids 1.
Pediatrics: Rarely reported; treatment approaches similar to adults but with cautious dosing 1.
Elderly: Consideration of comorbidities and potential drug interactions is crucial; careful monitoring is advised 1.
Comorbidities: Management should account for coexisting IgG4-related disease in other organs, requiring a multidisciplinary approach 1.Key Recommendations
Initiate corticosteroid therapy (prednisone 0.5-1 mg/kg/day) for confirmed diagnosis of Riedel's thyroiditis (Evidence: Strong 1).
Consider immunosuppressive agents like azathioprine for refractory cases (Evidence: Moderate 1).
Evaluate and manage surgical intervention for severe compressive symptoms or diagnostic uncertainty (Evidence: Expert opinion 1).References
1 Paul P, Hellmann A, Szade J, Rejszel-Baranowska J, Obołończyk Ł. Riedel's thyroiditis requiring an emergency surgery: rare manifestation of IgG4-related disease. Endokrynologia Polska 2024. link