Abstract
Sub-acute thyroiditis or De Quervain's thyroiditis is a viral, inflammatory disease which causes the serum release of thyroidal hormones and hyperthyroidism. The pathogenesis of thyroid follicle damage is unclear because the exclusive viral action or a concomitant autoimmune component, determined by the lymphoid infiltrate remain to be assessed. We describe the case of a patient under immunosuppressive treatment, who developed sub-acute thyroiditis with hormone release and hyperthyroidism. The patient, while was under immunosuppressive treatment for kidney transplant, exhibited a clinical picture and hormonal profile of hyperthyroidism. Thyroid scintiscan exhibited an extremely low uptake. Fine-needle cytologic diagnosis was granulomatous sub-acute thyroiditis (De Quervain's thyroiditis). This case suggests the primary or even exclusive role of the viral infection in hormone release and hyperthyroidism in sub-acute thyroiditis, excluding an autoimmune component.
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