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Chiari 2 without spinal dysraphism: does it blow a hole in the pathogenesis?
Valentina Citton1, Irene Toldo, Laura Balao
1Division of Neuroradiology, University Hospital of Padua, Italy. valentinacitton@gmail.com
Journal of Child Neurology
|March 2, 2012
Summary
Chiari malformation type 2, typically linked to myelomeningocele, can occur without spinal defects. This case highlights rare presentations of hindbrain protrusion and associated neurological issues, challenging diagnostic assumptions.
Area of Science:
- Neuroscience
- Developmental Biology
- Medical Imaging
Background:
- Chiari malformation type 2 (CM2) is defined by hindbrain herniation and supratentorial abnormalities.
- CM2 is strongly associated with myelomeningocele, often attributed to intrauterine cerebrospinal fluid (CSF) overdrainage.
- This association is considered a diagnostic rule in clinical practice.
Observation:
- A 14-year-old female presented with intellectual disability, spastic triparesis, and epilepsy.
- Brain MRI revealed a severe CM2.
- Spine MRI showed no signs of open spinal dysraphism.
Findings:
- The case presents a rare instance of CM2 without the expected open spinal dysraphism.
- This challenges the established CM2-myelomeningocele association.
- The study reviews literature on similar atypical CM2 cases.
Implications:
- Exceptions to the CM2-myelomeningocele rule necessitate careful neuroimaging review.
- Understanding these variations can refine diagnostic criteria for CM2.
- Further research into the pathogenesis of atypical CM2 is warranted.
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