Ultrastructure and electrodiagnosis of peripheral neuropathy in Cockayne's syndrome.

Cockayne's syndrome is a multisystem disease that begins in infancy and is inherited as an autosomal recessive. We studied a 4-year-old girl with nystagmus, ataxia, motor weakness, peripheral neuropathy, deficient growth, and developmental delay. Nerve biopsy revealed segmental demyelination and granular lysosomal inclusions on ultrastructural examination.