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Background: The ethmoidal roof is the thinnest bone of the skull base. Study of morphology of the ethmoidal roof on sinus CT Scan to avoid damaging the ethmoidal roof during sinus surgery. Objective: Describe the shape of the ethmoidal roof and some adjacent structures on computed tomography. Survey the relation between the shape of the ethmoidal roof and some adjacent structures. Patients and methods: Including 177 patients with nasosinusal syndromes who examined and underwent sinus CT scan at Hue University of Medicine and Pharmacy. Result: The mean hight of the lateral lamella of the cribrifom plate is 4.27 ± 1.96 mm on the right and 4.64 ± 1.92mm on the left. Keros type 1 accounted for 41.5%, type 2 accounted for 47.2% and type 3 accounted for 11.3%. Keros classification on the left was significantly higher than that on the right side. The hight of the nasal cavity was lowest in the Keros type 1 group and highest in type 3 (p=0.001). For more than 2 mm asymmetry of the hight of the lateral lamella of the cribrifom plate, the Keros 3 group showed a statistical more common when compared to the other groups (X2=15.62, p=0.004). The hight of the lateral lamella of the cribrifom plate at the ipsilateral side (deviated side) was higher than that of the contralateral side, but the difference is not statistically significant. Conclusion: Understanding potential asymmetries and variations of the skull base contour may assist the surgeons in avoiding complications in sinus surgery. Key words: The ethmoid roof, sinus surgery
Background: The ethmoidal roof is the thinnest bone of the skull base. Study of morphology of the ethmoidal roof on sinus CT Scan to avoid damaging the ethmoidal roof during sinus surgery. Objective: Describe the shape of the ethmoidal roof and some adjacent structures on computed tomography. Survey the relation between the shape of the ethmoidal roof and some adjacent structures. Patients and methods: Including 177 patients with nasosinusal syndromes who examined and underwent sinus CT scan at Hue University of Medicine and Pharmacy. Result: The mean hight of the lateral lamella of the cribrifom plate is 4.27 ± 1.96 mm on the right and 4.64 ± 1.92mm on the left. Keros type 1 accounted for 41.5%, type 2 accounted for 47.2% and type 3 accounted for 11.3%. Keros classification on the left was significantly higher than that on the right side. The hight of the nasal cavity was lowest in the Keros type 1 group and highest in type 3 (p=0.001). For more than 2 mm asymmetry of the hight of the lateral lamella of the cribrifom plate, the Keros 3 group showed a statistical more common when compared to the other groups (X2=15.62, p=0.004). The hight of the lateral lamella of the cribrifom plate at the ipsilateral side (deviated side) was higher than that of the contralateral side, but the difference is not statistically significant. Conclusion: Understanding potential asymmetries and variations of the skull base contour may assist the surgeons in avoiding complications in sinus surgery. Key words: The ethmoid roof, sinus surgery
Background:The aim of this study was to establish the morphometry and sexual dimorphism of olfactory fossa and its correlation with the types of crista galli in North Karnataka region.Method: Two hundred and twenty Multidetector computed tomographic (MDCT) scans were collected from North Karnataka region and analyzed by using RadiAnt DICOM Viewer. The depth and width of olfactory fossa, their side symmetry, types of crista galli and correlation between the depth of olfactory fossa with types of base of crista galli were calculated in both genders. Statistical analysis was done by using Student unpaired't' test. Conclusion:Keros type II of olfactory fossa was most common in the present study. There was significant difference (p˂0.05) in olfactory fossa depth when compared between right (mean=4.64mm) and left sides (mean=4.07mm) in females. There was no statistically significant difference found between the genderand the sides of depth and width of olfactory fossa. There was no statistically significant correlation found between the types of olfactory fossa and types of crista galli.The morphometry of olfactory fossa and crista galli would help neurosurgeons to assess these vulnerable regions of ethmoidal skull base in surgeries.
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