Peter is a mischievous 12-year-old boy with an irrepressible rebellious streak, but in the bleak London orphanage where he has lived his whole life those qualities do not exactly fly....
Chiari malformation, also known as an Arnold-Chiari malformation, is a congenital (present at birth) defect occurring in the back of the head where the brain and spinal cord connect.There are four types of Chiari malformations:1  Type 1 â Occurring when the base of the skull and upper spinal area do not form properly, a type 1 Chiari malformation commonly goes unnoticed until problems arise in the adolescent or adult years of life.here are four types of Chiari malformations: 1  Type 1 â Occurring when the base of the skull and upper spinal area do not form properly, a type 1 Chiari malformation commonly goes unnoticed until problems arise in the adolescent or adult years of life.
In the Arnold-Chiari Malformation, the Tonsils abnormally extend through the opening in the base of the Skull (the Foramen Magnum) and exert abnormally increased pressure on the Brain Stem as well as the upper portion of the Spinal Cord.he Spinal Cord connects to the Medulla above it and then on up to the rest of the Brain Stem. The Arnold-Chiari Malformation is defined by the pathological downward extension of the Cerebellar Tonsils through the Foramen Magnum and into the upper Cervical Spinal Canal.