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Also called cerebellar tonsillar ectopia, or tonsillar herniation. Although often congenital, Chiari malformation symptoms can also be induced due to physical head trauma, commonly from raised intracranial pressure secondary to a hematoma, or increased dural strain pulling the brain caudally into the foramen magnum.
The currently accepted radiographic definition for a Chiari malformation is that cerebellar tonsils lie at least 5mm below the level of the foramen magnum. Some clinicians have reported that some patients appear to experience symptoms consistent with a Chiari malformation without radiographic evidence of tonsillar herniation.
Herniation of cerebellar tonsils. [4] [38] [39] Tonsillar ectopia below the foramen magnum, with greater than 5 mm below as the most commonly cited cutoff value for abnormal position (although this is considered somewhat controversial). [27] [28] [40] [41] Syringomyelia of cervical or cervicothoracic spinal cord can be seen. Sometimes the ...
Cerebellar tonsillar ectopia, aka Chiari malformation, a herniation of the brain through the foramen magnum, which may be congenital or caused by trauma. Ectopic cilia, a hair growing where it isn't supposed to be, commonly an eyelash on an abnormal spot on the eyelid, distichia
Cerebellar tonsillar ectopia shares many of the same symptoms as CSF leak, [58] but originates either congenitally or from trauma, including whiplash strain to the dura. [69] An alternate method of locating the site of a CSF leak is to use heavily T2-weighted MR myelography. [24]
ectopia, ectopic pregnancy: ect(o)-outer, outside Greek ἐκτός (ektós) ectoblast, ectoderm, ectoplasm -ectasia, -ectasis: expansion, dilation: Greek ἔκτασις (éktasis) bronchiectasis, telangiectasia-ectomy: denotes a surgical operation or removal of a body part; resection, excision Greek ἐκτομή (ektomḗ), excision ...
Congenital abnormalities in the brain and progressive brain overgrowth can result in a variety of neurological problems that may require intervention. These include hydrocephalus, cerebellar tonsillar herniation , seizures and syringomyelia. These complications are not usually congenital, they develop over time often presenting complications in ...
Cerebellar tonsillar ectopia, or Chiari malformation, is a condition that was previously thought to be congenital but can be induced by trauma, particularly whiplash trauma. [14] Dural strain may be pulling the cerebellum inferiorly, or skull distortions may be pushing the brain inferiorly.