Cerebral palsy (CP) is defined as a nonprogressive but not unchanging disorder of posture or movement, caused by an abnormality of the brain and first evident at the stage of rapid brain development (Hughes and Newton, 1992). It is a common disorder of childhood, with an incidence of 1 in 250 to 1,000 births (Pharoah et al., 1987; Bundey and Alam, 1993). Ataxic cerebral palsy accounts for 5 to 10% of all forms of CP, and approximately 50% of ataxic CP is thought to be inherited as an autosomal recessive trait (McHale et al., 2000). Also see spastic cerebral palsy (e.g., 612900).

Reference
OMIM: Atypical cerebral palsy