Evaluating the effects of Onodi cells and accessory septa on sphenoiditis using a sinus navigation system
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Background and Objective: Onodi cells (OCs) and accessory septa (AS) may displace the sphenoid sinus causing sphenoiditis. To assess the impact of anatomic variations related to the sphenoid sinus (SS) on the prevalence of sphenoid sinusitis using computed tomography analysis. Materials and Methods: This was a retrospective analysis of high-resolution computed tomography (HRCT). 233 HRCT studies of the paranasal sinus obtained between July 2015 and April 2017 were enrolled. Sinus navigation system was used to evaluate OC and AS in HRCT planes. SSs were divided into 2 groups based on the presence of sphenoiditis. Results: Among all SSs included (n=466) in this study, 35 were associated with sphenoiditis (S+) and 431 were not (S- ). The prevalence of OC in S+ group was 31.43%, while the prevalence of OC in S-group was 47.80%. The distribution of OC type according to the classification scheme described by Wada et al, namely, optic canal, sella, and infrasella OC was 63.63%, 27.27%, and 0.09% in S+ group and 56.80%, 40.29%, and 0.03% in S-group, respectively. The prevalence of AS in S+ group was 77.14. Conversely, the prevalence of AS in S- group was 71.46%. Conclusion: There was no significant difference in the prevalence or characteristics of OCs and AS between patients with and without sphenoiditis. Future studies including a greater number of HRCTs that also evaluate other risk factors for sphenoiditis may be needed. Lastly, sinus navigation system is useful not only as a surgical tool, but as a tool for evaluating CT images as well.
Abstract
Background and Objective: Onodi cells (OCs) and accessory septa (AS) may displace the sphenoid sinus causing sphenoiditis. To assess the impact of anatomic variations related to the sphenoid sinus (SS) on the prevalence of sphenoid sinusitis using computed tomography analysis. Materials and Methods: This was a retrospective analysis of high-resolution computed tomography (HRCT). 233 HRCT studies of the paranasal sinus obtained between July 2015 and April 2017 were enrolled. Sinus navigation system was used to evaluate OC and AS in HRCT planes. SSs were divided into 2 groups based on the presence of sphenoiditis. Results: Among all SSs included (n=466) in this study, 35 were associated with sphenoiditis (S+) and 431 were not (S- ). The prevalence of OC in S+ group was 31.43%, while the prevalence of OC in S-group was 47.80%. The distribution of OC type according to the classification scheme described by Wada et al, namely, optic canal, sella, and infrasella OC was 63.63%, 27.27%, and 0.09% in S+ group and 56.80%, 40.29%, and 0.03% in S-group, respectively. The prevalence of AS in S+ group was 77.14. Conversely, the prevalence of AS in S- group was 71.46%. Conclusion: There was no significant difference in the prevalence or characteristics of OCs and AS between patients with and without sphenoiditis. Future studies including a greater number of HRCTs that also evaluate other risk factors for sphenoiditis may be needed. Lastly, sinus navigation system is useful not only as a surgical tool, but as a tool for evaluating CT images as well.
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