Ethnic Variation of Sinonasal Anatomy on CT Scan and Volumetric Analysis

  • Venkata Joga Prasanth Mokhasanavisu
  • Rohit SinghEmail author
  • R. Balakrishnan
  • Rajagopal Kadavigere
Original Article


To determine Ethnic differences in the frequency of the relatively common anatomical variants along with difference in anatomy of sinonasal region with surgical importance. A study was conducted to determine the frequency of anatomical variants, volumes of paranasal sinuses using computed tomography and to identify any difference between Group A consisting of people of Indian subcontinent and Group B consisting of people from north east Asian region. Volumetric analysis done using cumulative of area multiplied by slice thickness. The results were compared using Chi square test, p value < 0.05 was considered statistically significant. Among the common and uncommon anatomical variants (Agger nasi, pneumatized uncinate, concha bullosa etc.) there was no significant difference between the two groups. In both the groups Keros Type 1 was the most common type of ethmoid roof seen. On volumetric analysis sphenoid sinus volume was found to be higher in Indians without mongoloid features. Hence it’s ideal that in this era of endoscopic sinus surgery we tailor make approaches to address individual anatomical variation.


Paranasal sinuses Anatomic variation Ethnic CT-scan Volumetric analysis 


Compliance with Ethical Standards

Conflict of interest

The authors declare that they have no conflict of interest.

Ethical Approval

Approval from institutional ethical committee.

Informed Consent

Informed consent was obtained from all individual participants included in the study.


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Copyright information

© Association of Otolaryngologists of India 2019

Authors and Affiliations

  1. 1.Department of Otolaryngology – Head and Neck Surgery, Kasturba Medical CollegeManipal Academy of Higher EducationManipalIndia
  2. 2.Kasturba Medical CollegeManipal Academy of Higher EducationManipalIndia

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