Pediatr Radiol. 2025 Aug 7. doi: 10.1007/s00247-025-06341-z. Online ahead of print.
ABSTRACT
BACKGROUND: MPV17-related mitochondrial deoxyribonucleic acid (DNA) maintenance defects present in most affected individuals as an early-onset encephalohepatopathic disease. Diagnosis requires comprehensive molecular genetic testing, which is often not available in resource-limited settings. Therefore, the role of imaging as a diagnostic tool necessitates further exploration. Herein, we present the largest known cohort of patients with genetically confirmed MPV17-related mitochondrial DNA depletion syndrome, highlighting in detail the neuroimaging findings.
OBJECTIVE: To establish novel features on magnetic resonance imaging (MRI) that characterise MPV17-related mitochondrial DNA depletion syndrome, in order to provide a non-invasive, accessible, and reproducible biomarker inquiry.
MATERIALS AND METHODS: Retrospective, descriptive study based at a large tertiary level hospital. Eight patients with MPV17-related mitochondrial DNA depletion syndrome who had undergone brain MRI were identified between 2015 and 2023. Neuroimaging findings were captured and described in detail. Two board-certified radiologists with experience in paediatric neuroradiology reviewed all images by consensus.
RESULTS: All patients were homozygous for the MPV17: c.106C>T variant. Age at brain MRI ranged from 11 days to 8 months. Seven out of the eight patients showed signal abnormalities in the reticulospinal tracts and/or reticular formation. Other neuroimaging findings included leukoencephalopathy, injury to extra-reticular white matter tracts and frequent basal ganglia involvement. Newly identified areas of involvement include the perirolandic cortices, hippocampi, optic pathways and olfactory nerves.
CONCLUSION: Lesions in the reticular formation and reticulospinal tracts on brain MRI in a neonate or infant with hepatic dysfunction may represent a distinctive, albeit not specific, feature of MPV17-related mitochondrial DNA depletion syndrome.
PMID:40773069 | DOI:10.1007/s00247-025-06341-z
