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Related Experiment Videos

Chiari III malformation: imaging features.

M Castillo1, R M Quencer, R Dominguez

  • 1Section of Neuroradiology, University of Texas Medical School, Houston.

AJNR. American Journal of Neuroradiology
|January 1, 1992
PubMed
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Chiari type III malformations present with high cervical/low occipital encephaloceles. Magnetic resonance (MR) and computed tomography (CT) imaging are crucial for surgical planning, especially for venous anomalies.

Area of Science:

  • Neuroimaging
  • Pediatric Neurology
  • Congenital Malformations

Background:

  • Chiari type III malformations are rare congenital brain abnormalities.
  • These malformations involve the herniation of cerebellar and brainstem tissue through a defect in the occipital bone.

Purpose of the Study:

  • To analyze and discuss the magnetic resonance (MR) and computed tomography (CT) imaging features of Chiari type III malformations.
  • To highlight key diagnostic findings and associated anomalies.

Main Methods:

  • Retrospective review of MR and CT studies in nine neonates with Chiari type III malformations.
  • Analysis of imaging findings and correlation with pathological examination where available.

Main Results:

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  • All cases presented with high cervical/low occipital encephaloceles.
  • Common associated anomalies included deformed midbrain, dysgenesis of the corpus callosum, and petrous and clivus scalloping.
  • Venous anomalies within the encephaloceles were identified in surgical cases, and pathology revealed abnormalities not always visible on imaging.

    • Conclusions:

    • Preoperative MR imaging is essential for determining the position of the medulla and pons.
    • Awareness of the high incidence of venous anomalies is crucial to avoid surgical complications.