Fig. 4
From: Microlaryngoscopic surgery for pyriform sinus fistulas in children: a report of two cases
a The internal orifice of the fistula is clearly visible using forceps. It is narrow and durable. b After making an incision around the orifice, the mucosal layer is dissected using scissors. c The fistula after complete mucosal resection. d The pyriform sinus after suturing