Chiari is a rare genetic disorder that causes an abnormally large, protruding or distorted part of the brain.
It affects about one in 10,000 people.
It usually develops between birth and around five years old, but it can be triggered by a variety of circumstances.
It can affect the way that the body uses certain brain cells, affecting their function, which in turn can affect memory, learning, social interaction and the ability to think independently.
The most common complication is bilateral malformation, in which the brain is fused together.
In the UK, the cost of Chiari surgery ranges from £1.4m to £4.8m.
Chiari’s costs can also vary from country to country, according to the Royal College of Surgeons.
UK Chiari costs: £1,843,788 for bilateral malformations, £4,897,923 for a combined malformation and a bilateral fusion.
Source Al Jazeera EMAIL US CHIARI NEWSLETTER