2.5.1. Sinusectomy and primary closure
An ellipsoid incision was made separately in such a way that tissue loss will be minimal, and enclosing all primary and secondary sinus orifices at both sides separately using a No. 11 surgical blade. With the help of the stylet, the fistula tract was excised subcutaneously with blunt and sharp dissections (Figure 1a, 1b). Attention was paid not to leave any diseased tissue at the margins after excision, and bleeding points were cauterized for hemostasis. The subcutaneous dead space that forms after the excision was closed subcutaneously with absorbable sutures. Subsequently, the wound at both sides of the fistula was dressed with subcutaneous absorbable suture (Figure 1c, 1d).