[Lateral fistulas of the neck].

We present four new cases of lateral fistulas of the neck which were studied with a fistulographic method, using hydrosoluble iodine contrast. In three of the four cases we were able to demonstrate the existence of an incomplete external branchial fistula, while in the fourth case a complete branchial fistula was seen. In all cases the histopathological examination confirmed the presence of fistulous tracts which were caused by disturbances of embryonic development.