arnold-chiari malformation

<radiology> Chiari I herniation of medulla and cerebellar tonsils, 4th ventricle in normal position, Chiari II herniation of medulla, tonsils, vermis, 4th ventricle at foramen magnum, myelomeningocele, aqueductal stenosis most likely to be hydrocephalus, Chiari III further herniation, 4th ventricle below foramen magnum, encephalocele or myelo...
Found on http://www.mondofacto.com/facts/dictionary?arnold-chiari+malformation

Arnold-Chiari malformation

(from the article `nervous system disease`) ...may be associated with projection of the vertebral column upward. This condition may also occur in association with bone diseases such as ...
Found on http://www.britannica.com/eb/a-z/a/103

Arnold-Chiari Malformation

A congenital defect of the brain in which the brain tissue protrudes through the foramen magnum down into the upper cervical canal. Hydrocephalus is common in individuals with Arnold-Chiari Malformation and the brainstem, cranial nerves, and the lower portion of the cerebellum may be stretched or compressed. Common symptoms include breathing diif.....
Found on http://www.pregnology.com/AZ/A/9

Arnold-Chiari malformation

Type: Term Pronunciation: ar′nŏld kē-ah′rē Definitions: 1. malformed posterior fossa structures associated with caudad traction and displacement of the rhombencephalon as caused by tethering of the spinal cord; may be accompanied in some cases by spina bifida and associated anomalies such as meningomyelocele; usually mult...
Found on http://www.medilexicon.com/medicaldictionary.php?t=52452
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