A rare neurodegenerative disease usually presenting before the age of 30 with characteristics of dystonia, L-dopa-responsive parkinsonism, pyramidal signs and rapid cognitive decline. Prevalence is unknown. Only 14 cases have been reported to date. Caused by mutations in the phospholipase A2, group VI (PLA2G6) gene located on chromosome 22q13.1. Inherited in an autosomal recessive manner.