Fig. 4
From: Third or fourth branchial pouch sinus lesions: a case series and management algorithm
Complete resection of the fistula with the assistance of a probe combined with a pattern of neck dissection. a Inserting the probe into the internal opening of the branchial pouch sinus; (white arrow: tract opening; black arrow: metal probe). b Dissecting around the important anatomical features. (RLN: recurrent laryngeal nerve; CA: carotid artery; Th: thyroid; F: fistula). c Tracing the inner fistula where the probe is positioned and completely removing the fistula and surrounding scar. (RLN: recurrent laryngeal nerve; CA: carotid artery; Th: thyroid; F: fistula)