Extraocular muscle diameter in Makurdi, North Central Nigeria: what is normal?

Authors

  • Terkimbi I. Annongu Department of Radiology, College of Health Sciences, Benue State University Makurdi, Nigeria
  • Chia D. Msuega Department of Radiology, College of Health Sciences, Benue State University Makurdi, Nigeria
  • Hameed O. Mohammad Department of Radiology, College of Health Sciences, Benue State University Makurdi, Nigeria
  • Kator P. Iorpagher Department of Radiology, Benue State University Teaching Hospital, Makurdi, Nigeria
  • Chaha Kator Department of Opthalmology, College of Health Sciences, Benue State University Makurdi, Nigeria
  • Ayough N. Shagbaor Department of Radiography and Radiation Sciences, College of Health Sciences, Benue State University Makurdi, Nigeria
  • Wuave R. Bemgba Department of Radiography and Radiation Sciences, College of Health Sciences, Benue State University Makurdi, Nigeria
  • Magaji G. Ojaare Department of Radiology, Dal Arafat Specialist Hospital, Lafia Nassarawa, Nigeria

DOI:

https://doi.org/10.18203/2349-3933.ijam20212094

Keywords:

EOM, Normal values, CT

Abstract

Background: Establishing normal values of extra ocular muscle (EOM) diameter is essential in a given population. Factors including race, region, gender and environment affect the normal diameter of the EOM. The aim of the study was to determine the normal sizes of the EOM in a population in the North Central part of Nigeria using computed tomography (CT).

Methods: One hundred and eighty-three CT images of patients who underwent craniofacial imaging for other conditions and who met the inclusion criteria were evaluated. The maximum diameters of the EOMs on coronal reformatted CT images which are the superior group (SG) (superior rectus and the levator palpebral), inferior rectus (IR) medial rectus (MR) and lateral rectus (LR) were assessed.

Results: The mean values±SD obtained were 3.65±1.13, 3.93±0.94, 3.40±0.67, 3.43±0.92 for SG, 1R, MR, and LR muscles respectively on the right and 3.61±1.07, 3.86±0.92, 3.34±0.70, 3.42±0.08 for SG, IR MR and LR muscles respectively on the left. The order IR>SR>MR>LR of average muscle diameter was obtained. The females in this region showed slightly higher mean values of the diameter of the EOM than the males; however, this was not statistically significant. By age, there was no consistent correlation.

Conclusions: The established normal values of the EOM may serve as a reference point for ophthalmologist and for cosmetic surgeons and also will add to the pool of the existing knowledge for academic purposes.

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Author Biography

Terkimbi I. Annongu, Department of Radiology, College of Health Sciences, Benue State University Makurdi, Nigeria

Consultant Radiologist

 

References

Ogbole GI, Ogun OA, Olusumade D. Computed tomography measurement of extra-ocular muscle diameters in a population of normal patients in a tertiary hospital in Nigeria. Afr J Med Med Sci. 2014;43(3):245-50.

Pol CB, Chakraborty S, Gao J, Nguyen T, Torres C, Glikstein R. Imaging anatomy and pathology of extraocular muscles in adults. Can Assoc Radiol J. 2014;65(4):366-71.

Trokel SL, Hilal SK. Recognition and differential diagnosis of enlarged extraocular muscles in computed tomography. Am J Ophthalmol. 1979;87(4):503-12.

Rothfus WE, Curtin HD. Extraocular muscle enlargement: a CT review. Radiology. 1984;151(3):677-81.

Patrinely JR, Osborn AG, Anderson RL, Whiting AS. Computed tomographic features of nonthyroid extraocular muscle enlargement. Ophthalmology. 1989;96(7):1038-47.

Lerdlum S, Boonsirikamchai P, Setsakol E. Normal measurements of extraocular muscle using computed tomography. J Med Assoc Thai. 2007;90(2):307-12.

Gupta V, Prabhakar A, Yadav M, Khandelwal N. Computed tomography imaging-based normative orbital measurement in Indian population. Indian J Ophthalmol. 2019;67(5):659-63.

Weaver AA, Loftis KL, Tan JC, Duma SM, Stitzel JD. CT based three-dimensional measurement of orbit and eye anthropometry. Invest Ophthalmol Vis Sci. 2010;51(10):4892-7.

Sacca S, Polizzi A, Macri A, Patrone G, Rolando M. Echographic study of extraocular muscle thickness in children and adults. Eye. 2000;14(5):765-9.

Ozgen A, Ariyurek M. Normative measurements of orbital structures using CT. AJR Am J Roentgenol. 1998;170(4):1093-6.

Lee JS, Lim DW, Lee SH, Oum BS, Kim HJ, Lee HJ. Normative measurements of Korean orbital structures revealed by computerized tomography. Acta Ophthalmol Scand. 2001;79(2):197-200.

Tian S, Nishida Y, Isberg B, Lennerstrand G. MRI measurements of normal extraocular muscles and other orbital structures. Graefes Arch Clin Exp Ophthalmol. 2000;238(5):393-404.

Lee JS, Lim DW, Lee SH, Oum BS, Kim HJ, Lee HJ. Normative measurements of Korean orbital structures revealed by computerized tomography. Acta Ophthalmol Scand. 2001;79(2):197-200.

Kahaly GJ. Imaging in thyroid-associated orbitopathy. Eur J Endocrinol. 2001;145(2):107-18.

Lee JS, Lim DW, Lee SH, Oum BS, Kim HJ, Lee HJ. Normative measurements of Korean orbital structures revealed by computerized tomography. Acta Ophthalmol Scand. 2001;79(2):197-200.

Lerdlum S, Boonsirikamchai P, Setsakol E. Normal measurements of extraocular muscle using computed tomography. J Med Assoc Thai. 2007;90(2):307-12.

Sacca S, Polizzi A, Macri A, Patrone G, Rolando M. Echographic study of extraocular muscle thickness in children and adults. Eye. 2000;14(5):765-9.

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Published

2021-05-26

How to Cite

Annongu, T. I., Msuega, C. D., Mohammad, H. O., Iorpagher, K. P., Kator, C., Shagbaor, A. N., Bemgba, W. R., & Ojaare, M. G. (2021). Extraocular muscle diameter in Makurdi, North Central Nigeria: what is normal?. International Journal of Advances in Medicine, 8(6), 742–746. https://doi.org/10.18203/2349-3933.ijam20212094

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Original Research Articles