Cerebellar subtonsillar hernia

The cerebellar subtonsillar hernia deformity, also known as Arnold-Chiari malformation, Arnold-Chiari syndrome, is a congenital abnormal development of the hindbrain. It is a congenital posterior brain deformity caused by the abnormal development of the embryo that causes the lower medullary segment and the lower part of the four ventricles to enter the spinal canal. The cerebellar tonsil extends into a wedge shape into the occipital foramen or the cervical spinal canal. In severe cases, some of the lower earthworms are also herniad into the spinal canal. The posterior group of the brain nerves and the upper cervical nerve roots such as the glossopharyngeal, vagus, para, and sublingual are pulled down. , The foramen magnum and the upper cervical spinal canal were stuffed, and cerebrospinal fluid circulation was blocked, causing hydrocephalus. This disease is often accompanied by other craniocervical region deformities such as spinal meningocele, cervical spina bifida and cerebellar hypoplasia.

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