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MS optic neuritis-induced long-term structural changes within the visual pathway.

Marc Pawlitzki1, Marc Horbrügger2, Kristian Loewe2

  • 1From the Department of Neurology (M.P., M.H., K.L., J.K.), Otto von Guericke University, Magdeburg, Germany; Department of Neurology with Institute of Translational Neurology (M.P., S.G.M.), University Hospital Münster, Germany; Department of Computer Science (K.L.), Otto von Guericke University Magdeburg, Germany; Jung diagnostics GmbH (R.O.), Hamburg, Germany; Department of Ophthalmology (M.W., K.O.A.-N., M.B.H.), Otto von Guericke University, Magdeburg, Germany; Center of Behavioral Brain Sciences (M.B.H.), Magdeburg; Neuroimmunology and Multiple Sclerosis Research (R.O., S.S.), Department of Neurology, University Hospital Zurich, Switzerland; and Center for Neuroscience Zurich (S.S.), Federal Institute of Technology (ETH), Zurich, Switzerland. marc.pawlitzki@ukmuenster.de.

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Summary
This summary is machine-generated.

A single optic neuritis (ON) episode in multiple sclerosis (MS) causes lasting retinal and optic radiation damage. This suggests both retrograde and anterograde neuroaxonal degeneration long after the initial event.

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Radiology

Background:

  • Multiple sclerosis (MS) frequently affects the visual pathway, even early in the disease.
  • Optic neuritis (ON) is a common clinical manifestation of MS.
  • Long-term structural changes in the visual system following ON are not well understood.

Purpose of the Study:

  • To investigate long-term structural abnormalities in the visual system after a single episode of ON in MS patients.
  • To correlate structural damage with clinical history using MRI, OCT, and VEPs.

Main Methods:

  • Included 28 MS patients: 14 with a history of single ON (HON) and 14 without ON history (NON).
  • Utilized optical coherence tomography (OCT) for retinal nerve fiber layer (RNFL) and ganglion cell/inner plexiform layer (GCIPL) thickness.
  • Employed MRI for brain and optic radiation (OR) structural and diffusion-weighted imaging (DWI) analysis.

Main Results:

  • Patients with a history of ON showed significant thinning in RNFL and GCIPL compared to controls.
  • Diffusion metrics (FA, MD, RD, AD) in the optic radiation were significantly altered in the HON group.
  • No significant differences were found in global or regional gray and white matter volumes.

Conclusions:

  • A single ON episode leads to persistent structural damage in the retina and optic radiation.
  • Findings suggest both retrograde and anterograde neuroaxonal degeneration occur post-ON.
  • This highlights the cumulative impact of ON on the visual pathway in MS.