Chiari malformation: Definition By Mayo Clinic staff Chiari malformation is a condition in which brain tissue protrudes into your spinal canal. It occurs when part of your skull is abnormally small or misshapen, pressing on your brain and forcing it downward. Chiari malformation is uncommon, but improved imaging tests have led to more frequent diagnoses. The adult form, called Chiari malformation type I, develops as the skull and brain are growing. As a result, signs and symptoms may not occur until late childhood or adulthood. The most common pediatric form, called Chiari malformation type II, is present at birth (congenital). Treatment of Chiari malformation depends on the form, severity and associated symptoms. Regular monitoring, medications and surgery are treatment options. In some cases, no treatment is needed. For further Ref. link below. Sources: http://www.mayoclinic.
The Chiari malformation is an abnormality in the lower part of the brain called the cerebellum. There are several different forms. The most common type is the Chiari I malformation (CM) which this article addresses. Less commonly, it may be known as Arnold-Chiari malformation, tonsillar herniation or tonsillar ectopia. Most cases of Chiari are congenital, meaning they are present from birth. In normal anatomy, the cerebellar tonsils are located just above this line called the foramen magnum. But in an individual with Chiari, the tonsils hang below the line (herniate) into the spinal canal. The degree to which the tonsils extend can vary tremendously. What are the symptoms? The most common symptom of Chiari malformation is a headache, which begins at the back of the head (neck) and radiates upward. The pain is often made worse or can be brought on by coughing, sneezing or straining. These activities are known as valsalva maneuvers. Visual problems such as nystagmus (involuntary eye move
Sufferers of Chiari Malformation are often living in pain with blackouts, seizures, speech problems, and blindness. Sources: http://www.andalusiastarnews.