References Rusbridge C and Knowler SP, 2003 Hereditary aspects of
occipital bone hypoplasia and syringomyelia (Chiari type I malformation) in cavalier King Charles spaniels.
Veterinary Record 153: 107 - 112 Rusbridge C and Knowler SP, 2004 Inheritance of
Occipital Bone Hypoplasia (Chiari type I malformation) in Cavalier King Charles spaniels.