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Category: Volume 08 Issue 12 December 2020
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Title: A CT Scan Study Showing Prevalence of Onodi Cells in Patients with Sinonasal Complaints

Authors: Raag Reeti, Md Jawed Akhtar, Avanish Kumar, Rishi Mani Srivastava

 DOI: https://dx.doi.org/10.18535/jmscr/v8i12.34

Abstract

 

Introduction: Posterior ethmoid cells may pneumatize the sphenoid bone posteriorly to give rise to a cell, which extends superolateral to the sphenoid sinus for a much longer distance which is known as the Onodi cell. Onodi cell may complicate the outcome of functional endoscopic sinus surgery (FESS) as it may be confused with the sphenoid sinus. The present study was undertaken to determine the prevalence of Onodi cells on CT scan in patients having sinonasal complaints.

Materials & Methods: This was a descriptive observational study carried out on 150 patients who presented with various sino-nasal complaints and underwent CT Scan in the Department of Radiodiagnosis, Bangur Institute of Neurosciences, Kolkata. Their CT scans were studied retrospectively for the presence of Onodi cells. Radiological variations data were summarized by routine descriptive statistics namely counts and percentages for categorical variables. Fisher’s Exact Tests and were applied to calculate the ‘p’ value to find out any statistically significant difference between males and females.

Results: Onodi cells were found in 6.6% (10 cases) in the present study, 4.6% in males and 2% in females. ‘p’ value in this case was 0.334 on applying Fisher’s Exact test.

Conclusion: Onodi cell being in the close vicinity of sphenoid sinus is a very important variation which should be looked for by the surgeon before planning any endoscopic surgery. This study tried to find out the prevalence of the Onodi cells in Eastern India to help the FESS surgeons and improve its outcomes.

Keywords: posterior ethmoid cell, functional endoscopic sinus surgery, optic nerve.

References

  1. Ludwick JJ, Taber KH, Manolidis S, Sarna A and Hayman LA. A computed tomographic guide to endoscopic sinus surgery: axial and coronal views. J Comput Assist Tomogr 2002; 26: 317-22.
  2. Reddy UM, Dev B. Pictorial essay: Anatomical variations of paranasal sinuses on multidetector computed tomography-How does it help FESS surgeons? Indian J Radiol Imaging 2012 Oct; 22 (4): 24-317.
  3. Keast A, Yelavich S, Dawes P and Lyons B. Anatomical variations of the paranasal sinuses in Polynesian and New Zealand European computerized tomography scans. Otolaryngol Head Neck Surg 2008; 139: 216-21.
  4. Bradoo R. Anatomical Principles of Endoscopic Sinus Surgery: A Step by Step Approach. Jaypee Brothers Medical Publishers (P) Ltd. 2007.p.23.
  5. Adeel M, Rajput M S, Akhtar S, Ikram M, Arain A, Khattak YJ. Anatomical variations of nose and paranasal sinuses: CT scan review. J Pak Med Assoc 2013 Mar;63(3):317-9.
  6. Pinas IP, Sabate J, Carmona A, Catalina-Herrera CJ, Castellanos JJ. Anatomical variations in the human paranasal sinus region studied by CT. J Anat 2000 Aug;197(pt2):221-227.
  7. Chaitanya D, Suseclamma D, Singh V. Anatomical variations of paranasal air sinuses – A CT scan study. Journal of the Anatomical Society of India June 2015;64(1):87-90.
  8. Arslan H, Aydinlioglu A, Bozkurt M, Egeli E. Anatomic variations of the paranasal sinuses: CT examination for endoscopic sinus surgery. Auris Nasus Larynx 1999 jan;26(1):39-48.
  9. Shpilberg KA, Daniel SC, Doshi AH, Lawson W, Som PM. CT of Anatomic Variants of the Paranasal Sinuses and Nasal Cavity: Poor correlation with radiologically significant rhinosinusitis but importance in surgical planning. American Journal of Roentgenology June 2015;204(6):1255-60.
  10. Mazza D, Bontempi E, Guerisi A, elonti S, Cipolla G, Perrone A, Lomele L, et al. Paranasal sinuses anatomic variants : 64- slice CT evaluation. Inerve Stomatol 2007 Jun; 56(6):311-18.
  11. Chandel NS, Gupta R, Vyas MM. Computerized Tomographic Evaluation of Anatomical Variations of Paranasal Sinus & Nose. National Journal of Medical & Dental Research Oct- Dec 2015;4(1):48-72.
  12. Deosthale NV, Sonali P, Singh B, Hrkare VV, Dhoke PR, Dhote KS. Anatomical variations of nose and paranasal sinuses in chronic rhinosinusitis. People’s Journal of Scientific Research July 2014;vol 7(2).
  13. Dua K, Chopra H, Khurana AS, Munjal M. CT scan variations in chronic sinusitis. Indian J Radiol Imaging 2005; 15:315-20.
  14. Chakraborty P, Jain RK. Radiologic variations of nose and paranasal sinuses: A CT based study. JMSCR May 2016;4(5):10536-41.
  15. Tantilipikorn P, Churojana A, Chiewwit P, Phuttharak W, Lerdlum S, Aeumjaturapat S, et al. The accuracy of limited CT in the evaluation  of chronic rhinosinusitis and for endoscopic sinus  surgery: A multicenter study. Siriraj Medical Journal 2009;61(1):3-7.
  16. Maru YK, Gupta V. Anatomic variations of the bone in sinonasal CT. Indian Journal of Otolaryngol and Head Neck Surgery 2001;53:123-28.
  17. Nitinavakarn B, Thanaviratananich S, Sangsilp N. Anatomical variations of the lateral nasal wall & paranasal sinuses: A CT study for endoscopic sinus surgery (ESS) in Thai patients. J Med Assoc Thai 2005 Jun;88(6):763-8.

Corresponding Author

Md. Jawed Akhtar

Assistant Professor, Department of Anatomy, Indira Gandhi Institute of Medical Sciences, Patna (Bihar)