Types of Chiari Malformations
Arnold Chiari Malformation PPT
Arnold Chiari Malformation Radiology
What are Chiari Malformations?
“Group of abnormalities involving the rhombencephalon (hindbrain) and the contents of the CV junction”
Chiari 1 Malformation
5-mm or more caudal displacement of the cerebellar tonsils inferior to the foramen magnum
Restricts normal CSF flow across the craniocervical junction
Commonly associated findings are cervical syringomyelia(50-75%) and, on occasion, hydrocephalus (10%)
Line which is used for this measurement of tonsillar herniation is McRae Line (Basion to Opisthion)
Chiari 2 Malformation
-Greater amount of tissue extends into the spinal canal compared with Chiari 1 malformation
-characteristic displacement of the medulla, fourth ventricle, and cerebellum through the foramen magnum.
-almost all neonatal patients with Chiari II have a myelomeningocele
Chiari 3 Malformation
-Extremely rare
-Characterized by low occipital and high cervical encephalocele
-There is herniation of posterior fossa contents, that is, the cerebellum and/or the brainstem, occipital lobe, and fourth ventricle.
Chiari 4 Malformation
-This is characterized by marked cerebellar hypoplasia or aplasia and tentorial hypoplasia. There is no hindbrain herniation.
-No hydrocephalus
Other Type of Chiari Malformations
-Chiari type 0
syringohydromyelia without hindbrain herniation that respond to posterior fossa decompression (CSF flow across foramen magnum impaired)
-Chiari type 1.5
Severe form of Chiari 1.
Entire cervicomedullary junction (and obex) is situated below the foramen magnum
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25 май 2020
