Journal of Pediatric Epilepsy 2017; 06(03): 161-163
DOI: 10.1055/s-0037-1604293
Case Report
Georg Thieme Verlag KG Stuttgart · New York

Neuroimaging in Neonatal Nonketotic Hyperglycinemia

Mahesh Kamate
1   Division of Paediatric Neurology, Department of Paediatrics, KLE University, J. N. Medical College, Belgaum, Karnataka, India
,
Virupaxi Hattiholi
2   Department of Radiology, KLE University, J. N. Medical College, Belgaum, Karnataka, India
› Author Affiliations
Further Information

Publication History

30 December 2016

19 June 2017

Publication Date:
19 July 2017 (online)

Abstract

Nonketotic hyperglycinemia is a fatal disorder of glycine metabolism presenting with intractable epilepsy, hypotonia, and developmental delay in infancy. Diagnostic tests,such as cerebrospinal fluid glycine estimation and genetic diagnostic methods, are not widely available in developing countries and hence many cases are missed or wrongly diagnosed. The magnetic resonance imaging features, such as abnormal signal intensity in the dorsal pons, midbrain, central tegmental tract, cerebral peduncle, and posterior limb of the internal capsule indicate an important clue to the possibility of the disease and help in guiding the treating neonatologist.

 
  • References

  • 1 Hamosh A, Johnston MV. Nonketotic hyperglycinemia. In: Scriver C, Beaudet A, Valle D. , et al, eds. The Metabolic and Molecular Bases of Inherited Disease. 8th ed. New York, NY: McGraw-Hill; 2001: 2065-2078
  • 2 Applegarth DA, Toone JR. Nonketotic hyperglycinemia (glycine encephalopathy): laboratory diagnosis. Mol Genet Metab 2001; 74 (1-2): 139-146
  • 3 Press GA, Barshop BA, Haas RH, Nyhan WL, Glass RF, Hesselink JR. Abnormalities of the brain in nonketotic hyperglycinemia: MR manifestations. Am J Neuroradiol 1989; 10 (02) 315-321
  • 4 Khong PL, Lam BC, Chung BH, Wong KY, Ooi GC. Diffusion-weighted MR imaging in neonatal nonketotic hyperglycinemia. Am J Neuroradiol 2003; 24 (06) 1181-1183
  • 5 Sener RN. Nonketotic hyperglycinemia: diffusion magnetic resonance imaging findings. J Comput Assist Tomogr 2003; 27 (04) 538-540
  • 6 Dobyns WB. Agenesis of the corpus callosum and gyral malformations are frequent manifestations of nonketotic hyperglycinemia. Neurology 1989; 39 (06) 817-820
  • 7 Van der Knaap MS, Valk J. Magnetic Resonance of Myelin, Myelination, and Myelin Disorders. New York, NY: Springer-Verlag; 1995: 209-210
  • 8 Takanashi J, Kanazawa M, Kohno Y. Central tegmental tract involvement in an infant with 6-pyruvoyltetrahydropterin synthetase deficiency. Am J Neuroradiol 2006; 27 (03) 584-585