Publication date: Apr 10, 2019
To study if the thalamic lateral geniculate nucleus (LGN) is affected in multiple sclerosis (MS) due to anterograde degeneration from optic neuritis (ON) or retrograde degeneration from optic radiation (OR) pathology, and if this is relevant for visual function.
In this cross-sectional study, LGN volume of 34 patients with relapsing-remitting MS and 33 matched healthy controls (HC) was assessed on MRI using atlas-based automated segmentation (MAGeT). ON history, thickness of the ganglion cell-inner plexiform layer (GC-IPL), OR lesion volume, and fractional anisotropy (FA) of normal-appearing OR (NAOR-FA) were assessed as measures of afferent visual pathway damage. Visual function was tested, including low-contrast letter acuity (LCLA) and Hardy-Rand-Rittler (HRR) plates for color vision.
LGN volume was reduced in patients vs HC (165.5 +/- 45.5 vs 191.4 +/- 47.7 mm, B = -25.89, SE = 5.83, p
LGN volume loss in MS indicates structural damage with potential functional relevance. Our results suggest both anterograde degeneration from the retina and retrograde degeneration from the OR lesions as underlying causes. LGN volume is a promising marker reflecting damage of the visual pathway in MS, with the advantage of individual measurement per patient on conventional MRI.
Papadopoulou, A., Gaetano, L., Pfister, A., Altermatt, A., Tsagkas, C., Morency, F., Brandt, A.U., Hardmeier, M., Chakravarty, M.M., Descoteaux, M., Kappos, L., Sprenger, T., and Magon, S. Damage of the lateral geniculate nucleus in MS: Assessing the missing node of the visual pathway. 17737. 2019 Neurology.