The prerequisite for endoscopic sinus surgery is
MRI of paranasal sinuses
CT of paranasal sinuses
Mucocilliary clearing testing
Acoustic tests
Endoscopic surgery of inflammatory diseases of paranasal sinuses (sinusitis or polyp) requires a very detailed preoperative knowledge of the individual anatomical conditions and pathological changesCT scan is used best to visualize sinus areasCT scan provides an excellent definition of paranasal sinuses and is a prerequisite for endoscopic surgeryRef: PL Dhingra, Diseases of Ear, Nose & Throat, 7th edition, pg no. 220 - 221
Nose and paranasal sinuses