Related Experiment Video
Updated: Dec 17, 2025

Quantification of Orofacial Phenotypes in Xenopus
Published on: November 6, 2014
Variations of Ethmoid Roof in the Iranian Population- A Cross Sectional Study
Maryam Moradi1, Bahare Dalili2
1Department of Radiology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran.
Introduction:
This study aimed to investigate the distribution of ethmoid roof variation and symmetry according to Keros classification.
Materials And Methods:
This cross-sectional study assessed the paranasal CT scans of 600 patients over 18 years of age with no history of surgery, trauma, or localized fracture in the ethmoid, nose, and anterior skull base. The lateral lamella of the cribriform plate (LLCP) sizes were measured and classified as Keros type I (1-3 mm), II (4-7mm), and III (8-16mm). Moreover, the symmetry was surveyed in accordance with the LLCP measurements on both sides of the ethmoid roof. These variations were analyzed regarding gender and age.
Results:
In total, 600 patients participated in this study out of whom 311 cases were male. According to the results, the mean age of the participants was 37.50±16.63 years. Furthermore, the mean values of the LLCP height for the right and left sides were 4.17±1.69 and 4.93±1.97 mm, respectively. Moreover, the asymmetry was observed in 38.3% of the cases, and they were classified as 36.7% Keros type I, 50.5% Keros type II, and 12.8% Keros type III.
Conclusion:
Keros type II and symmetry were the most common variations in this study. In addition, these variations were independent of age and gender.
More Related Videos
14:52Isolation, Characterization and Comparative Differentiation of Human Dental Pulp Stem Cells Derived from Permanent Teeth by Using Two Different Methods
Published on: November 24, 2012
07:32Author Spotlight: 3D Movement Assessment of Maxillary Posterior Teeth in Clear Aligner Treatment
Published on: February 23, 2024
Related Concept Videos
Cranial Bones: Lateral View
The temporal bone forms the lower lateral side of the skull. The temporal bone is subdivided into several regions. The flattened upper portion is the squamous portion of the temporal bone. Below this area and projecting anteriorly is the zygomatic process of the temporal bone, which forms the posterior portion of the zygomatic arch. Posteriorly is the mastoid portion of the temporal bone. Projecting...
Surveys
Nose and Nasal Cavity
Cross-Sectional Research
Socioemotional Experience and Gender Development