[Thoughts on the illness of Hermann von Reichenau (1019-1054)].

Hermann from Reichenau--Hermannus contractus--apparently suffered from a disease which led to considerable physical handicap leaving his outstanding intellectual talents undamaged. Various statements about his condition--an epileptic, suffering from spasticity, afflicted by poliomyelits--have never been reconsidered. Using the biography written by this disciple Berthold, the most important contemporary source about Hermanns' life, an approach to a correct diagnosis from a neurologists point of view was the aim of this study. By unbiased analysis of the symptoms described by Berthold a neurologic syndrome is worked out: it comprised a flaccid tetraparesis involving the bulbar area. The sensory as well as the autonomic nervous system were apparently not involved. Intellectual functions were unaffected. Considering this syndrome and other details of Hermanns' life as well as the beginning and course of his illness, a traumatic birth injury, an early childhood disease and a central nervous as well as an infectious disease are ruled out. Muscle disease is considered possible, but motor neuron disease--either amyotrophic lateral sclerosis or spinal muscular atrophy--seems to be the most convincing diagnosis.