REFERENCES
1. Dobson R, Giovannoni G. Multiple sclerosis - a review. Eur J Neurol. 2019;26(1):27-40.
2. Oh J, Vidal-Jordana A, Montalban X. Multiple sclerosis: clinical aspects. Curr Opin Neurol. 2018;31(6):752-759.
3. Ascherio A. Environmental factors in multiple sclerosis. Expert Rev Neurother. 2013;13(12 Suppl):3-9.
4. Assaf Y, Chapman J, Ben-Bashat D, et al. White matter changes in multiple sclerosis: correlation of q-space diffusion MRI and 1H MRS.Magn Reson Imaging. 2005;23(6):703-710.
5. Chawla S, Kister I, Wuerfel J, et al. Iron and Non-Iron-Related Characteristics of Multiple Sclerosis and Neuromyelitis Optica Lesions at 7T MRI. AJNR Am J Neuroradiol. 2016;37(7):1223-1230.
6. Wilhelm H, Schabet M. The Diagnosis and Treatment of Optic Neuritis.Dtsch Arztebl Int. 2015;112(37):616-625; quiz 626.
7. Balcer LJ. Clinical practice. Optic neuritis. N Engl J Med.2006;354(12):1273-1280.
8. Ricci P, Maggini E, Mancuso E, Lodise P, Cantisani V, Catalano C. Clinical application of breast elastography: state of the art. Eur J Radiol. 2014;83(3):429-437.
9. Vural M, Acar D, Toprak U, et al. The evaluation of the retrobulbar orbital fat tissue and optic nerve with strain ratio elastography.Med Ultrason. 2015;17(1):45-48.
10. Yang YP, Xu XH, Guo LH, et al. Qualitative and quantitative analysis with a novel shear wave speed imaging for differential diagnosis of breast lesions. Sci Rep. 2017;7:40964.
11. Ogurel T, Burulday V. Strain and Shear Wave Elastography in Diagnosis of Retrobulbar Neuritis. J Neuroophthalmol.2020;40(2):169-173.
12. Ophir J, Cespedes I, Garra B, Ponnekanti H, Huang Y, Maklad N. Elastography: ultrasonic imaging of tissue strain and elastic modulus in vivo. European journal of ultrasound. 1996;3(1):49-70.
13. Inal M, Tan S, Yumusak EM, Sahan MH, Alpua M, Ornek K. Evaluation of the optic nerve using strain and shear wave elastography in patients with multiple sclerosis and healthy subjects. Med Ultrason.2017;19(1):39-44.
14. Sahan MH, Dogan A, Inal M, Alpua M, Asal N. Evaluation of the Optic Nerve by Strain and Shear Wave Elastography in Patients With Migraine.J Ultrasound Med. 2019;38(5):1153-1161.
15. Hoff JM, Dhayalan M, Midelfart A, Tharaldsen AR, Bo L. Visual dysfunction in multiple sclerosis. Tidsskr Nor Laegeforen.2019;139(11).
16. Perez Sanchez S, Eichau Madueno S, Rus Hidalgo M, et al. Usefulness of optic nerve ultrasound to predict clinical progression in multiple sclerosis. Neurologia. 2018.
17. Beck RW, Cleary PA, Anderson MM, Jr., et al. A randomized, controlled trial of corticosteroids in the treatment of acute optic neuritis. The Optic Neuritis Study Group. N Engl J Med.1992;326(9):581-588.
18. Chan JW. Optic neuritis in multiple sclerosis. Ocul Immunol Inflamm. 2002;10(3):161-186.
19. Green AJ, McQuaid S, Hauser SL, Allen IV, Lyness R. Ocular pathology in multiple sclerosis: retinal atrophy and inflammation irrespective of disease duration. Brain. 2010;133(Pt 6):1591-1601.
20. Soderstrom M, Ya-Ping J, Hillert J, Link H. Optic neuritis: prognosis for multiple sclerosis from MRI, CSF, and HLA findings.Neurology. 1998;50(3):708-714.
21. Swanton JK, Fernando KT, Dalton CM, et al. Early MRI in optic neuritis: the risk for clinically definite multiple sclerosis.Mult Scler. 2010;16(2):156-165.
22. Cellina M, Floridi C, Rosti C, et al. MRI of acute optic neuritis (ON) at the first episode: Can we predict the visual outcome and the development of multiple sclerosis (MS)? Radiol Med.2019;124(12):1296-1303.
23. Batur M, Batur A, Cilingir V, et al. Ultrasonic Elastography Evaluation in Optic Neuritis. Semin Ophthalmol.2018;33(2):237-241.
24. Kim DH, Jun JS, Kim R. Measurement of the Optic Nerve Sheath Diameter with Magnetic Resonance Imaging and Its Association with Eyeball Diameter in Healthy Adults. J Clin Neurol.2018;14(3):345-350.
25. Vaiman M, Abuita R, Bekerman I. Optic nerve sheath diameters in healthy adults measured by computer tomography. Int J Ophthalmol.2015;8(6):1240-1244.
26. De Bernardo M, Vitiello L, Rosa N. Optic nerve ultrasound measurement in multiple sclerosis. Acta Neurol Scand.2019;139(4):399-400.
27. Kwon YJ, Kim YH, Baek SH, Son MH, Lee JH, Kim BJ. Transorbital ultrasonography in acute optic neuritis: Can it be a supportive diagnostic tool? Mult Scler Relat Disord. 2019;31:54-58.
Table 1: The detailed SWE findings of both groups are described.