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Neuroradiology

, Volume 59, Issue 11, pp 1155–1163 | Cite as

Nonketotic hyperglycinemia: spectrum of imaging findings with emphasis on diffusion-weighted imaging

  • Shaimaa Abdelsattar Mohammad
  • Heba Salah Abdelkhalek
Paediatric Neuroradiology

Abstract

Purpose

The purpose of this study was to explore brain abnormalities in nonketotic hyperglycinemia (NKH) using diffusion-weighted imaging (DWI) and when feasible, diffusion tensor imaging (DTI) and tractography.

Methods

Seven patients with confirmed diagnosis of NKH (8 days–2 years) underwent brain MRI. Conventional T1 and T2WI were acquired in all patients, DWI in six and DTI and tractography in two (4 months and 2 years). Measurements of fractional anisotropy (FA), radial diffusivity (RD), axial diffusivity (AD) and Trace from eight white matter regions were compared between the two patients and age-matched controls. Tractography of corpus callosum, superior longitudinal fasciculus and corticospinal tracts was performed with extraction of their FA and diffusivity indices.

Results

MRI showed nonspecific brain atrophy in three children. Corpus callosum atrophy was found as a part of these atrophic changes. Cerebellar vermian hypoplasia and supratentorial hydrocephalus were seen in one patient. The topographic distribution of diffusion restriction was different among patients. The affected white matter regions were not predominantly following the expected areas of myelination according to patients’ age. Deep grey matter nuclei were affected in one patient. DTI revealed lower FA with higher RD in most of the measured white matter regions and tracts. These changes were more appreciated in the 2-year-old patient. However, Trace was higher in the 2-year-old patient and lower in the 4-month-old one. The extracted tracts were decreased in volume.

Conclusion

DWI, DTI and tractography with FA and diffusivity measurements can give insights into white matter microstructural alterations that can occur in NKH.

Keywords

Vacuolating myelinopathy Diffusion-weighted image (DWI) Diffusion tensor imaging (DTI) Fractional anisotropy Corpus callosum 

Notes

Funding

No funding was received for this study.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Ethical approval

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.

Informed consent

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

Supplementary material

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ESM 1 (DOCX 15 kb)
234_2017_1913_MOESM2_ESM.docx (16 kb)
ESM 2 (DOCX 15 kb)

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Copyright information

© Springer-Verlag GmbH Germany 2017

Authors and Affiliations

  • Shaimaa Abdelsattar Mohammad
    • 1
  • Heba Salah Abdelkhalek
    • 2
  1. 1.Radiodiagnosis Department, Faculty of MedicineAin-Shams UniversityCairoEgypt
  2. 2.Medical Genetics Unit, Pediatric Department, Faculty of MedicineAin-Shams UniversityCairoEgypt

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