Özet:

Objective With the developing medical technology, functional endoscopic sinus surgery (FESS) is applied quite frequently in paranasal sinus surgeries in otolaryngology practice. However, due to the nasal cavity structure, variations and neighborhoods, it is the body cavity that should be considered. Preoperative paranasal sinus computed tomography (CT) evaluation of the nasal cavity is mandatory. In our study, we especially aimed to reveal olfactory fossa variations with paranasal CT. With this article, we aimed to define the pre-FESC variations of the people in the Lakes District and to increase the awareness of surgeons against complications in the preoperative period. Material and Methods The images of the patients who applied to our hospital for sinusitis and underwent paranasal sinus CT between 01.01.2019 and 15.03.2019 were analyzed retrospectively by two radiologists. 112 men and 88 women A total of 200 patients aged 18-69 years were included. The measurements of the lateral laminae in the right and left nasal cavity for each patient and the depths of the olfactory fossa were classified according to Keros types. The lateral lamina height was determined and the patients were classified into 3 groups. Depths of 1-3 mm for keros type 1, 4-7 mm for keros type 2 and 8-16 mm for keros type 3 were taken. The obtained data were then compared with similar data in the literature. Results Lateral lamina lengths for right side 144 (72%) individuals in the keros type 1 group and 56 (28%) individuals in the keros type 2 group were classified, and 142 (71%) individuals in the keros type 1 group and 58 (29%) individuals in the keros type 2 group were classified for the left side. In the keros type 1 variation on the right, 76 individuals were male and 68 individuals were female. In the keros type 2 variation on the right, 36 individuals were male and 20 individuals were female. In the keros type 1 variation on the left, 74 individuals were male and 68 individuals were female. In the keros type 2 variation on the left, 38 individuals were male and 20 individuals were female. No individuals were classified for right and left in the keros type 3 group. Right The mean lamina lateralis length was calculated as 2,49±0,76 in the keros type 1 variation, and 4,21±0,54 in the keros type 2 variation. On the left The mean length of the lamina lateralis in the keros type 1 variation was calculated as 2,33±0,79, while the mean length in the keros type 2 variation was calculated as 4,2±0,54. The number of individuals with different keros types in the right and left measurements and keros asymmetry was observed as 52 (26%) out of 200 individuals. Conclusion While keros type 1 was observed most frequently in our study with a rate of 71.5%, Keros Type 3 was never encountered, and we found keros asymmetry as 26% in our study. In our study, type 1 variant was observed at a high rate for both genders, but it did not create a statistically significant difference. In a similar study conducted in the literature, significant differences were observed in the percentages, and we interpreted this difference as the variation belonging to the people of the Lakes District. In particular, nasal cavity variations show various variations in different regions. The absence of type 3 variation in the Lakes District is an advantage for this region. Although the type 1 variation with the smallest depth of the olfactory fossa does not make a statistically significant difference, the highest number of observations is also an advantage for the people of the Lakes District, as it carries less risk of complications.

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