Fig. 1
From: Third or fourth branchial pouch sinus lesions: a case series and management algorithm
Suggested algorithm for the management of lesions in third or fourth branchial pouch sinuses. (Operative type I: traditional open surgery; Operative type II: internal fistula resection by CO2 laser under a suspension laryngoscope and endoscope; Operative type III: internal fistula resection by CO2 laser combined with external fistula resection by small neck incision; Operative type IV: complete resection of the fistula, assisted by the lumbar anesthesia tube as a metal probe combined with a pattern of neck dissection)