<unk>  is a surgical procedure where in a small opening is made in the floor of the<unk><unk>  facilitating drainage of its contents. Drainage of the<unk><unk>  is done through the floor of<unk><unk>  above the inner canthus.
Frontal sinus trephination
Trabeculectomy
Iridodonesis
Astragalectomy
Transsphenoidal surgery
Middle ear implant
Mastoidectomy
Head transplant