Table 1.

Phases of transnasal endoscopic surgery.

ID	Name	Start	End
P0	Outside the body	Endoscope exits the body	Endoscope enters the body
P1	Optics Preparation	Recording connected	Enter the nose
P2	Middle turbinate resection	Optic insertion, dissection and cutting of the turbinate	Hemostasis of the turbinate
P3	Nasoseptal flap preparation	Creation of the flap from the nasal septum	Placement of the flap in the maxillary sinus, choana
P4	Ethmoidectomy and sphenoidal sinus opening	Ethmoid resection; resection of the posterior septum	Sphenoid sinus drilling and removal of its mucosa
P5	Sellar opening	Drilling of rostrum and sella turcica	Exposed sella dura
P6	Dural opening	Dura coagulation	End and beginning of resection
P7	Tumour resection	Tumor resection	Hemostasis
P8	Dural closure	Placement of fat/Duragen	Placement of the nasoseptal flap/Tisseel