Assessment of Evan’s Index in North-Western Nigeria using Computerised Tomography

Aim: To determine the Evan’s Index of Nigerians using computerized tomography in Sokoto North-Western Nigeria. Study Design: Retrospective cross- sectional. Place and duration of study: Department of Anatomy Usmanu Danfodiyo University Sokoto and Department of Radiology Usmanu Danfodiyo University Teaching Hospital Sokoto, between January, 2020 and January, 2022. Methodology: Normal brain CT scans of one hundred and seventy-eight subjects from the Radiology Department of the Usmanu Danfodiyo University Teaching Hospital, whose ages ranged from 1 to 70 year. The Evans index was determined by the ratio of the measured distance between the tips of the frontal horns of lateral ventricles and the inner skull tables at the midpoint of the cranium in axial plane. Results: The Evan’s indexes were larger in male than the females and these differences were not statically significant except in the age group 51-60years where statistically significant difference was observed between male and female (p=0.042). The minimum Evan’s index was 0.02cm in male and 0.01 females and the maximum bi-frontal index was 0.40cm in male and 0.38cm in females. Conclusion: The Evan’s indexes and it relation with sex and age in our environment was determined.