In case of acute<unk> itis when not responding completely to medical management. During endoscopic<unk>  surgery, it can be used to identify the<unk><unk>  opening inside the nasal cavity. Endoscopically, it is detected by visualizing flushed flourescein dye into the nasal cavity. This process is a reliable method to detect the<unk><unk>  outflow tract. Also while in some cases after endoscopic<unk>  surgery,<unk><unk>  trephining is indicated in order to prevent stenosis of<unk><unk>  infundibulum by passing down a cather into<unk>  recess. Following endoscopic<unk><unk>  surgery,<unk>  can be used for instillation of medications like topical antibiotics and steroid irrigation.
Frontal sinus trephination
Trabeculectomy
Iridodonesis
Astragalectomy
Transsphenoidal surgery
Middle ear implant
Mastoidectomy
Head transplant