Riedel’s Struma Associated with Subacute Thyroiditis, Hypothyroidism, and Hypoparathyroidism

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Abstract
Riedel''s struma [invasive fibrous thyroiditis] with dense fibrous invasion of surrounding muscle and fat was found in a patient who had clinical subacute thyroiditis superimposed on primary hypothyroidisim. Riedel''s struma may sometimes be an uncommon stage in the more common subacute form of thyroiditis, although (as in this patient) an unusual coincidence of subacute thyroiditis and Riedel''s struma is also possible. Spontaneous primary hypoparathyroidism developed; parathyroid function returned to normal concomitant with the spontaneous resolution of the goiter after partial resection. This patient also represents another instance of hyperthyroidism developing in a previous hypothyroid patient.

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