[Hallervorden-Spatz disease: presentation of a new case].

A case of Hallervorden-Spatz's disease is described in a thirteen-year-old patient, with typical case symptoms of pyramidalism, dystonia and regressive motor control, over the last four years. MRI provided a bilateral palidal image in 'tiger eye'. The possible appearance of early forms have been stressed, characterised by a learning delay and a regressive syndrome starting between 5-10 years of age, along with later forms which manifest themselves mainly as Parkinson's disease. The MRI findings are of considerable value when diagnosing 'in vivo'; the pathogeny is not clear, despite current theories.