A disorder of the white matter of the brain causing neurological problems, which can occur, anytime from childhood to adulthood. Characteristics of the disease include learning disabilities, retinopathy, atrophy of the optic nerves, spasticity, infertility in males, vertigo, tinnitus, hearing loss, paroxysmal kinesigenic dyskinesia and psychiatric disorders. In affected individuals, myelin becomes edematous causing impaired nerve impulse transmission. Caused by mutations in the CLCN2 gene. Inherited in an autosomal recessive pattern.