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This study aims to determine relationship of optic nerves to posterior paranasal sinuses, its types, incidence and prevalence among study population of Mandya district, Karnataka. This observational study comprised 124 patients who were recommended for FESS and were referred to radiology department for CT scan between July 2019 to December 2019 at MIMS, Mandya. The age and sex of the patients along with the symptoms and its duration was recorded. All the patients underwent a comprehensive medical history and head and neck physical examination. A high resolution, 1.25 mm thick CT scan was taken for the study. Relationship of optic nerves to posterior paranasal sinuses was categorized according to Delano classification. Descriptive statistics like mean and percentages were used for analysis using SPSS v.22. The findings showed the prevalence of Onodi cells in 22.6% of the patients. Onodi cells were observed in 8.9% on the right side and 5.6% on left side of the patients respectively. In 8.1% of the patients, bilateral Onodi cells were present. ACP pneumatization was present in 25.1% of the patients bilaterally. ACP pneumatisation was found on the right side and left side in 10.5% and 6.5% respectively. 124 patients underwent CT of paranasal sinuses during study period and course of 248 optic nerves were examined in relation to posterior paranasal sinuses. Type 1, Type 2, Type 3, and Type 4 optic nerves was present in 83.33%, 8.87%. 12.1%, and 21.78% respectively. Bilateral Type 1 optic nerves was present in 58.88% patients, both Type 2 and Type 3 optic nerves were seen bilaterally in 3.23% of patients and bilateral Type 4 optic nerve was seen in 10 (8.06%) cases. Optic nerve Type 1 (83.88%) was the most frequent nerve type, followed by Type 4 (21.78%). In conclusion, the anatomical variations of paranasal sinuses are very important to be identified preoperatively since sphenoid sinus and optic nerve relation is known for its variation. Before endoscopic sinus surgery, one needs to know this anatomy using CT of paranasal sinuses using Delano classification of optic nerve.

Evaluation of optic nerve variations in relation to posterior paranasal sinuses among study population of Mandya District of Karnataka State