[Fisher's syndrome].

The authors describe a 43-year-old man with ophthalmoplegia, ataxia and areflexia and with 0.42 g/l of protein in the cerebrospinal fluid. EMG disclosed some slowing down of the conduction velocity in the motor fibres of the extremities. Treatment with synacthen depot, cocarboxylase and vitamins gave a good effect. The described case corresponds closely to Fisher's syndrome and may be a special form of brain-stem encephalitis involving the mesencephalon.