Determination of Evan’s Index Using Computerised Tomography in Sokoto North-Western Nigeria

Jibrin Usman Danjuma *

Department of Anatomy, College of Health Science, Usmanu Danfodiyo University, Sokoto, Nigeria.

Bello Abubakar

Department of Anatomy, College of Health Science, Usmanu Danfodiyo University, Sokoto, Nigeria.

*Author to whom correspondence should be addressed.


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.

Keywords: Determination, Evan’s index, tomography, Nigerians

How to Cite

Danjuma , Jibrin Usman, and Bello Abubakar. 2023. “Determination of Evan’s Index Using Computerised Tomography in Sokoto North-Western Nigeria”. Asian Journal of Research and Reports in Neurology 6 (1):151-56.


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Scott, ML, Golden, CJ, Ruedrich, SC and Bishop, RJ Ventricular enlargement in major depression. Psychiatry Research. 1983;8:91-93.

Ambili, P Ct measurements of two cerebroventricular indices and their relation with age. Journal of Evidence Based Medicine Health. 2017; 4(6): 303-306.

Toma, AK, Holl, E, Kitchen, ND and Watkins, LD Evans’ index revisited: The need for an alternative in normal pressure hydrocephalus. Neurosurgery 2011;68:939 -44.

Hashimoto, M, Ishikawa, M, Mori, E and Kuwana, N Study of INPH on Neurological Improvement (SINPHONI). Diagnosis of idiopathic Normal pressure hydrocephalus is supported by MRI-based scheme: A prospective cohort study. Cerebrospinal Fluid Research. 2010; 7:18.

Idowu, OE, Balogun, MM Visual function in infants with congenital hydrocephalus with and without myelomeningocoele. Childs Nervous System 2014; 30: 327–30.

Gallia, GL, Rigamonti, D and Williams, MA The diagnosis and treatment of idiopathic normal pressure hydrocephalus. Nature Clinical Practice Neurology 2006;2(7):375-81.

Ishii, K, Kanda, T, Harada, A, Miyamoto, N, Kawaguchi, T and Shimada, K Clinical impact of the callosal angle in the diagnosis of idiopathic normal pressure hydrocephalus. Europian Radiology, 2008; 2,18: 2678–83.

Von Bezing, H, Andronikou, S, van Toorn, R and Douglas, T Are linear measurements and computerized volumetric ratios determined from axial MRI useful for diagnosing hydrocephalus in children with tuberculous meningitis? Childs Nervous System 2012;28: 79–85.

Moore, DW, Kovanlikaya, I, Heier, LA, Raj, A, Huang, C and Chu, KW A pilot study of quantitative MRI measurements of ventricular volume and cortical atrophy for the differential diagnosis of normal pressure hydrocephalus. Neurology Research International 2012; 71: 8150.

Haug, G Age and sex dependence of size of normal ventricles on computed tomography. Neuroradiology. 1977;14;(4): 201-204.

Gyldensted, C and Kosteljanetz M Measurements of the normal ventricular system and hemispheric sulci of 100 adult patients with computed tomography. Neuroradiology. 1977;14: 138-192.

Skullerud, K Variations in the size of the human brain. Influence of age, sex, body length, body mass index, alcoholism, Alzheimer changes, and cerebral atherosclerosis. Acta Neurology 1985;102: 1-94.

Ahmed, UH, Solomon, ED, Sefiya, AK, Banabas, D, Abdullahi, J and Olaniyan, F Third and fourth cerebral ventricular sizes among normal adults in Zaria-Nigeria. Sub- Saharan African Journal Medicine 2015;2: 89-92.

Odebode, TO, Shokunbi, MT, Malomo, AO, Familusi, JB, Agbeja-Baiyeroju, AM and Ogunseyinde, AO The relationship between ventricular size and visual function in children with hydrocephalus. African Journal of Medical Sciences, 1998; 27:213–8.

Poca MA, Sahuquillo J, Mataró M, Benejam B, Arikan F, Báguena M. Ventricular enlargement after moderate or severe head injury: A frequent and neglected problem. Journal Neurotrauma 2005;22:1303–10.

Hamidu AU, Olarinoye-Akorede SA, Ekott DS, Danborno B, Mahmud MR, Balogun MS. Computerized tomographic study of normal Evan's index in adult Nigerians. J Neurosci Rural Pract. 2015;6:55–8. [PMC free article] [PubMed] [Google Scholar]

Reddy VU, Hegde KV, Agrawal A, Pathapati RM, Arumulla M Normative values for Evan's index on CT scan for apparently healthy individuals. J Anat Soc India. 2015;64:137–40. [Google Scholar].

Takeda S, Hirashima Y, Ikeda H, Yamamoto H, Sugino M, Endo S. Determination of indices of the corpus callosum associated with normal aging in Japanese individuals. Neuroradiology. 2003;45:513–8.[PubMed] [Google Scholar]

Sema P, Yasemin OF, Mahmut O, Gül KA, Hilmi YA Morphometric MRI study of the brain ventricles in healthy Turkish subjects. Int J Morphol. 2019;37:554–60. [Google Scholar]