Branchial cysts, sinuses, and fistulas are rare anomalies, and bilateral presentation is even more uncommon, consisting of only two to three percent of all cases. There have been several reports of bilateral branchial cysts or sinuses, but only a few cases of bilateral branchial fistulas have been reported. But in our review of literature, we were not able to come across a similar case of a branchial fistula on one side and a branchial sinus on the other. The most comparable occurrence we could find was of a simultaneous second branchial cleft fistula on the left and right-sided sinus with cystic dilatation.
Suresh, Pillai; C, Agarwal Ashish; S G, Mahesh; and A, Mallick Shaharyar
"A rare bilateral second arch branchial anomaly,"
Manipal Journal of Medical Sciences: Vol. 2
, Article 8.
Available at: https://impressions.manipal.edu/mjms/vol2/iss1/8