Chiari malformation is a condition where the lower part of the brain, the cerebellar tonsils, protrude through the foramen magnum, the opening at the bottom of the skull. Surgery is the primary treatment for Chiari malformation and is typically recommended when the symptoms are severe and/or progressive.
The criteria for Chiari malformation surgery are determined by the individual patient’s clinical presentation, as well as the availability of specialists and resources. Generally, surgery is recommended when the symptoms are severe enough to cause significant disruption to the person’s daily life, or if the symptoms are progressive.
In addition to the severity of the symptoms, other criteria for Chiari malformation surgery include the presence of syrinx, hydrocephalus, and/or a Chiari II malformation. Syrinx is a fluid-filled cavity within the spinal cord, which can cause compression of the spinal cord, leading to neurological deficits. Hydrocephalus is the accumulation of cerebrospinal fluid within the skull, which can increase intracranial pressure and cause further neurological damage. Finally, a Chiari II malformation is a more severe form of Chiari malformation, in which the lower part of the brain descends further into the spinal canal than in a Chiari I malformation.
Surgical treatment for Chiari malformation includes decompression of the cerebellar tonsils, duraplasty to widen the foramen magnum, and the placement of a shunt to drain accumulated CSF, if needed. The goal of surgery is to reduce the symptoms and prevent further neurological damage.
In summary, the criteria for Chiari malformation surgery are determined on an individual basis and depend on the severity of symptoms, the presence of syrinx, hydrocephalus, and/or a Chiari II malformation, and the availability of specialists and resources. Surgery is recommended when the symptoms are severe enough to cause disruption to daily life or if they are progressing. The goal of surgery is to reduce symptoms and prevent further neurological damage.