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Change in optic nerve sheath diameter as a radiological marker of outcome from endoscopic third ventriculostomy in children

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Abstract

Purpose

The purpose of this study was to investigate the value of the change in optic nerve sheath diameter (ONSD) as a radiological marker of endoscopic third ventriculostomy (ETV) outcome in children.

Methods

Magnetic resonance imaging (MRI) scans of patients on whom ETVs were performed between the periods of January 2009 and June 2013 were reviewed. ONSD measurements on pre- and post-operative images were performed by two blinded observers, and the relationship between the change in these measurements and outcome from ETV were investigated. These findings were then also compared to conventional imaging features associated with ETV outcome.

Results

MRI scans of 24 patients were adequate to measure the ONSD pre- and post-operatively. In patients with successful ETV (n = 19), the mean change in ONSD was 0.73 mm and in patients with a failed ETV (n = 5), the mean change in ONSD was 0.18 mm (p = 0.0007). A change in ONSD of 7.5 % of the initial measurement demonstrated a sensitivity of 92.9 % and a sensitivity of 85.7 % for ETV outcome (area under the receiver operating characteristic curve (AUROC) = 0.96).

Conclusion

Change in ONSD is a useful radiological marker of ETV outcome and may be used in combination with conventional radiological parameters to aid decision-making in this difficult group of patients.

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Acknowledgments

A special thank you to the MRI radiographers, particularly Clarrisa and Gafsa for all their extra efforts in capturing the relevant images.

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Authors and Affiliations

  1. Paediatric Neurosurgery Unit, Division of Neurosurgery, Faculty of Health Sciences and School of Child and Adolescent Health, University of Cape Town, Red Cross War Memorial Children’s Hospital, Cape Town, 7700, South Africa

    Llewellyn C. Padayachy, Anthony A. Figaji & Graham A. Fieggen

  2. Paediatric Radiology Department, School of Child and Adolescent Health, University of Cape Town, Red Cross War Memorial Children’s Hospital, Cape Town, 7700, South Africa

    Tracy Kilborn

  3. Biostatistics and Epidemiology unit, Faculty of Health Sciences, University of Cape Town, Cape Town, 7700, South Africa

    Henri Carrara

Authors
  1. Llewellyn C. Padayachy
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  2. Tracy Kilborn
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  3. Henri Carrara
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  4. Anthony A. Figaji
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  5. Graham A. Fieggen
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Corresponding author

Correspondence to Llewellyn C. Padayachy.

Appendix

Appendix

Human research ethics committee approval number: 674/2013. Informed consent was taken from all patients in the study.

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Padayachy, L.C., Kilborn, T., Carrara, H. et al. Change in optic nerve sheath diameter as a radiological marker of outcome from endoscopic third ventriculostomy in children. Childs Nerv Syst 31, 721–728 (2015). https://doi.org/10.1007/s00381-015-2655-0

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  • DOI: https://doi.org/10.1007/s00381-015-2655-0

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