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Review
. 2015 May;21(6):678-88.
doi: 10.1177/1352458514567216. Epub 2015 Feb 6.

Neuromyelitis optica and multiple sclerosis: Seeing differences through optical coherence tomography

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Review

Neuromyelitis optica and multiple sclerosis: Seeing differences through optical coherence tomography

J L Bennett et al. Mult Scler. 2015 May.

Abstract

Neuromyelitis optica (NMO) is an inflammatory autoimmune disease of the central nervous system that preferentially targets the optic nerves and spinal cord. The clinical presentation may suggest multiple sclerosis (MS), but a highly specific serum autoantibody against the astrocytic water channel aquaporin-4 present in up to 80% of NMO patients enables distinction from MS. Optic neuritis may occur in either condition resulting in neuro-anatomical retinal changes. Optical coherence tomography (OCT) has become a useful tool for analyzing retinal damage both in MS and NMO. Numerous studies showed that optic neuritis in NMO typically results in more severe retinal nerve fiber layer (RNFL) and ganglion cell layer thinning and more frequent development of microcystic macular edema than in MS. Furthermore, while patients' RNFL thinning also occurs in the absence of optic neuritis in MS, subclinical damage seems to be rare in NMO. Thus, OCT might be useful in differentiating NMO from MS and serve as an outcome parameter in clinical studies.

Keywords: Neuromyelitis optica; ganglion cell layer; multiple sclerosis; optic neuritis; optical coherence tomography; retinal nerve fiber layer.

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Conflict of interest statement

Conflict of interest: None declared.

Figures

Figure 1.
Figure 1.
Retinal parameters acquired by OCT. (a) Fundus image showing the acquisition of the peripapillary RNFL thickness. OCT records a ring scan of 3.4 mm diameter around the optic nerve head, which is divided into quadrants. (b) The total macular volume is derived from a volume scan and contains all retinal layers in a 6 mm diameter cylinder around the fovea centralis. (c) Intra-retinal layer segmentation in a spectral domain OCT image. (d) MME in a patient with optic neuritis. MME locations are marked by yellow arrows. OCT: optical coherence tomography; RNFL: retinal nerve fiber layer; S: superior; N: nasal; I: inferior; T: temporal; TMV: total macular volume; GCL; ganglion cell layer; IPL: inner plexiform layer; INL: inner nuclear layer; OPL: outer plexiform layer; ONL: outer nuclear layer; ELM: external limiting membrane; IS/OS: inner segments/outer segments of the photoreceptor layer; RPE: retinal pigment epithelium; MME: microcystic macular edema.
Figure 2.
Figure 2.
Typical differences in retinal damage between NMO-ON and MS-ON. (a) RNFL thickness values for different locations of the peripapillary ring scans including comparison to a healthy reference group. (b) Thickness map of the retinal GCL, derived with help of a semiautomatic segmentation software. The NMO-ON patient shows more severe thinning both in the RNFL and GCL. MS: multiple sclerosis; ON: optic neuritis; NMO: neuromyelitis optica; RNFL: retinal nerve fiber layer; GCL: ganglion cell layer.

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