MULTIDETECTOR COMPUTED TOMOGRAPHY VALUATION OF OLFACTORY FOSSA DEPTH REGARDING FUNCTIONAL SINUS ENDOSCOPIC SURGERY IN EGYPTIAN PATIENTS
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Keywords
Olfactory fossa, cribriform plate, endoscopic sinus surgery, Keros classification, lateral lamella, crista galli.
Abstract
Background: functional endoscopic sinus surgery is widely performed for many disease of nose and sinuses diseases and some of its complications related to olfactory fossa anatomical varieties.
Our study aim is to evaluate the olfactory fossae depth, dimensions, and morphology according to the Keros' classification on pre functional endoscopic sinus surgery (pre-FESS) and determine the incidence and degree of asymmetry in the height of the ethmoid roof in the Egyptian population.
Methods: Cross section analysis of 50 patients multidetector CT skull base studies (100 sides) was performed and the depth of OF was measured from vertical height of lateral lamella. in between 2022 - 2023. Statistical Methods: Results were analyzed according to gender and laterality using independent sample T‑test and Chi‑square test.
Results: According to the Keros classification, the incidence of different types of olfactory fossae was as follows: Type I olfactory fossa was found in 34 sides (34%), of which 18 (19%) were found on right side and 15 (15%) on the left side. Type II olfactory fossa was found in 61 sides (61%), of which 29 (29%) were found on right side and 32 (32%) on the left side. Type III olfactory fossa was found in 5 sides (5%), of which 2 (2%) were found on right side and 3(3%) on the left side. Asymmetry in the ethmoid roof we found in 17 cases (34%).
Conclusions: Keros’ type II was the commonest followed by type I and type III. There was asymmetry in the depth of the olfactory fossae in 17 (34%) cases. There was no significant gender predilection as far as type and asymmetry were considered.
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Yasser Mohammed Fekry Hefny
Department of Radiology, Faculty of Medicine (For Girls), Al Azhar University, Cairo, Egypt
Olfat Abdel Aziz Sayed Ahmed Khaled
Department of Ear, nose and Throat, Faculty of Medicine (For Girls), Al Azhar University, Cairo, Egypt
Manal Farag Khaled
Department of Radiology, Faculty of Medicine (For Girls), Al Azhar University, Cairo, Egypt
Abdullah Hussein
Department of Radiology, Faculty of Medicine (For Girls), Al Azhar University, Cairo, Egypt
Samy Ibrahim Kamel
Department of neurosurgery ,Faculty of Medicine (For Girls), Al Azhar University, Cairo, Egypt