Chiari II Malformation

Chiari II Malformation is a condition affecting the brain and spinal cord, specifically involving the lower part of the brain called the cerebellum and the brainstem. It occurs when these structures are pushed down into the spinal canal, which can block the flow of fluid around the brain and spinal cord. This can lead to problems with movement, balance, and coordination, as well as difficulties with breathing and swallowing. The condition is often linked to a birth defect called myelomeningocele, a type of spina bifida where the spinal cord does not develop properly. Children with this malformation may experience symptoms early in life due to pressure on the brainstem and disrupted fluid flow. It is a complex disorder that affects the nervous system and requires careful medical evaluation.

Chiari II Malformation is a congenital malformation characterized by the downward displacement of the cerebellar vermis, brainstem, and fourth ventricle through the foramen magnum into the cervical spinal canal. It is caused by a developmental defect associated with myelomeningocele, leading to a small posterior fossa and altered cerebrospinal fluid dynamics. This malformation results in hydrocephalus, brainstem dysfunction, and often neurological deficits such as cranial nerve palsies and motor impairments. The condition is significant due to its impact on central nervous system function and its association with spina bifida. The pathophysiology involves both mechanical compression and impaired CSF circulation, which can cause syringomyelia and other complications. Diagnosis and management require multidisciplinary care due to the complexity of neurological and systemic involvement.