Recurrent acute suppurative thyroiditis.
Recurrent acute left-sided suppurative thyroiditis was observed and treated in an eight-year-old girl. Barium swallow performed after the third episode revealed the presence of a pyriform sinus fistula extending to the upper pole of the left lobe. Despite resection of the fistula, she relapsed for a fourth time. The fistula was again seen on esophagogram. A probe was left inside the tract during subsequent surgery, thus facilitating its complete removal. AST occurs most commonly as a result of the persistence of a connection between the throat and the thyroid gland which is otherwise extremely resistant to infection. AST is usually left-sided and not associated with thyroid dysfunction. Recurrences are common unless the congenital fistula is identified and completely excised.