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Published on: December 28, 2014
Neuroimaging findings in hyperargininemia
Serdal Güngör1, Ayşehan Akinci, Ahmet Kemal Firat
1Inonu University, Faculty of Medicine, Department of Pediatrics, Malatya, Turkey. gungorserdal@yahoo.com
Summary
Hyperargininemia, a urea cycle disorder, causes neuronal damage due to high arginine levels. Brain MRI and MRS revealed abnormal metabolite peaks and white matter changes in affected siblings.
Area of Science:
- Biochemistry
- Neurology
- Medical Imaging
Background:
- Hyperargininemia results from a defect in the arginase enzyme, crucial for the urea cycle.
- The exact mechanisms of neuronal damage in hyperargininemia are not fully understood, but elevated arginine levels are implicated.
- This study investigates the brain imaging and spectroscopy patterns in siblings with hyperargininemia.
Observation:
- Conventional MRI revealed mild cerebral and cerebellar atrophy.
- Infarcts were noted in the bilateral posterior putamen and insular cortex.
- Single voxel magnetic resonance spectroscopy (MRS) was performed on white matter.
Findings:
- MRS showed elevated choline/creatine ratios, suggesting altered cell membrane metabolism.
- An abnormal peak at 3.8 ppm was observed, likely indicating arginine deposition.
- These findings correlate with the clinical presentation of neuronal damage.
Implications:
- This is the first study to report the brain MRS pattern in hyperargininemia.
- The findings enhance understanding of the neuroimaging characteristics of this rare metabolic disorder.
- This research may aid in earlier diagnosis and improved management strategies for hyperargininemia.
