Hsin M K, Barker G J, Spitz L
Department of Paediatric Surgery, Great Ormond Street Hospital for Sick Children, London, UK.
J R Coll Surg Edinb. 1998 Apr;43(2):125-6.
Congenital pyriform sinus fistula is a rare defect arising from the failure of obliteration of the third or fourth pharyngeal pouch remnant. It is a recognized potential cause of acute suppurative thyroiditis.