The results of follow-up of 76 children with progressive ataxia first
reported in 1988 are described with special reference to type of poten
tial underlying metabolic diseases. In 70% of cases the clinical follo
w-up did not lead to reconsideration of diagnoses. Six of 23 biochemic
ally and morphologically re-examined children got a new and definite d
iagnosis: 1 myoclonic encephalopathy with ragged red fibres, 2 carbohy
drate-deficient glycoprotein syndrome, 1 neuroborreliosis, 1 Hallervor
den-Spatz disease and 1 leucodystrophy. Different clinical groups are
discussed.