[Cockayne syndrome].

A 9-year-old girl with characteristic clinical signs of Cockayne's syndrome type I (cachectic dwarfism, "senile" like appearance, mental retardation, progressive neurologic and retinal degeneration) is presented. Computerized tomography and magnetic resonance imaging of the brain have shown a large malformation in cerebral posterior fossa. The case also has unusual aspects: pronounced congenital hypertrichosis and dark pigmented teeth. To our knowledge, these signs have never been described in the literature in connection with this rare syndrome.