Recurrent acute suppurative thyroiditis secondary to pyriform sinus fistula due to Staphylococcus sciuri with subclinical hyperthyroidism in an adult. A diagnostic and therapeutic challenge

Thyrotoxicosis can occur in up to 42% of cases of acute suppurative thyroiditis, making it less relevant to differentiate it from other causes of thyroiditis.In adults with no obvious risk factors, congenital malformations should be considered, especially when the condition affects the left lobe.To avoid recurrences, it is necessary to evaluate the pyriform sinus in any age group and patient adherence to medical instructions is essential.