[Acute thyroiditis caused by Eikenella corrodens and abnormality of the left pyriform sinus].

A case of suppurative thyroiditis is reported. The initial course was insidious and mimicked De Quervain subacute thyroiditis. The abscess was surgically drained. It contained numerous Eikenella corrodens bacilli. Fibroscopy of pharyngo-laryngeal region showed that the left pyriform sinus was abnormal. Surgical removal of a fistula of the fourth branchial pouch was performed in order to prevent recurrence of the thyroiditis.