الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
Chronic rhinosinusitis is defined as the presence of two or more symptoms one of which should be either nasal blockage/ obstruction/ congestion or nasal discharge (anterior/posterior nasal drip) with/without facial pain/pressure and with/without reduction or loss of smell for 12 weeks or more. Our study was performed on 200 consecutive patients with CRS whose categorized according to Lang´s classification of sphenoid sinus pneumatization into conchal, presellar, sellar and postsellar. The sellar type of SS pneumatization was found to be the most clinically relevant variant among our population in 35% of the patients ,and this result agrees with the reported literatures. There was significant statistical difference between ethmoidal , sphenoidal CRS and other types in relation to SS patterns. There were no significant statistical differences between either gender or age in CRS. The preoperative CT evaluation of the sellar region is a necessary whenever transsphenoidal surgery is considered to determine the location and extent of SS walls, to shorten the operative time, and to minimize morbid consequences. - 74 - The preoperative CT reports about SS pneumatization pattern, sinus septation, dehiscence and or protrusion of carotid canal, vidian canal, vidian nerve, optic canal, internal carotid artery , foramen rotundum, optic nerve, maxillary nerve and Onodi cells during the preparatory stages of the endoscopic pituitary and SS surgeries. Although extensive pneumatization of SS facilitates extended approaches of transsphenoidal endoscopic surgeries, it poses an increased risk of iatrogenic complications such as neurovascular injuries , intracranial hematoma, bony erosion and CSF leaks.