Fig. 3
From: Microlaryngoscopic surgery for pyriform sinus fistulas in children: a report of two cases
a Direct laryngoscopy shows the internal orifice at the left pyriform sinus. b The internal orifice is fragile owing to inflammation. A circumferential incision is made around the internal orifice using scissors and cupped forceps. c The mucosal incision is sutured using 4–0 Vicryl®. d The pyriform sinus after suturing