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Diffusion tensor imaging of the optic disc in idiopathic intracranial hypertension

  • Diagnostic Neuroradiology
  • Published:
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A Letter to the Editor to this article was published on 28 November 2018

Abstract

Purpose

To study optic disc in idiopathic intracranial hypertension (IIH) with diffusion tensor imaging.

Methods

Prospective study was carried out on 31 consecutive patients with IIH and 17 age and sex-matched controls that underwent diffusion tensor imaging of optic nerve. Fractional anisotropy (FA) and mean diffusivity (MD) of optic disc were measured by two readers. Grades of papilledema and visual field defects were evaluated by ophthalmologist.

Results

FA of optic disc was significantly lower in IIH than controls (p = 0.001) with excellent inter-observer agreement (K = 0.93) of both readers. The cutoff FA used to differentiating IIH from controls were 0.28 and 0.29 with area under curve (AUC) of 0.921 and 0.914, accuracy 92% and 91%, and sensitivity 97% and 96%. MD of optic disc were significantly higher in IIH than in controls (p = 0.001) with excellent inter-observer agreement (K = 0.91) of both readers. The cutoff MD used to differentiating IIH from controls was 1.51 and 1.22 × 10−3 mm2/s with AUC 0.943 and 0.922, and accuracy 94% and 92% respectively. FA of optic disc was significantly lower in early than advanced papilledema and visual field defects (p = 0.001, 0.001) respectively. The MD of optic disc was significantly higher in early than advanced papilledema and visual field defects (p = 0.001, 0.001) respectively.

Conclusion

Diffusion tensor imaging parameters of optic disc are non-invasive reliable imaging parameters that can be used for diagnosis of IIH and well correlated with papilledema and visual field defects.

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Abbreviations

AUC:

Area under the curve

FA:

Fractional anisotropy

IIH:

Idiopathic intracranial hypertension

MD:

Mean diffusivity

ROC:

Receiver operating characteristics

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Correspondence to Ahmed Abdel Khalek Abdel Razek.

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The authors declare that they have no conflict of interest.

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All procedures performed in the studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.

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Informed consent was obtained from all individual participants included in the study.

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Razek, A.A.K.A., Batouty, N., Fathy, W. et al. Diffusion tensor imaging of the optic disc in idiopathic intracranial hypertension. Neuroradiology 60, 1159–1166 (2018). https://doi.org/10.1007/s00234-018-2078-1

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  • DOI: https://doi.org/10.1007/s00234-018-2078-1

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