Isolated brain-stem death. Case report with demonstration of preserved visual evoked potentials (VEPs).

Brain-stem death is a state in which brain-stem functions have ceased whereas the hemispheres still have electrical activity. We report a patient with a haematoma over the cerebellum and the pons who showed a preserved electroencephalogram and VEPs whereas all clinical signs of cerebral death was present. Normal VEPs in isolated brain-stem death have not yet been reported. We conclude that in any case of infratentorial lesion, an electroencephalogram should be recorded for the diagnosis of brain death.