[Dementia and psychotic symptoms in amyotrophic lateral sclerosis].

We present 2 case histories of patients, treated in psychiatric clinics because of psychotic disorders, in whom further investigation revealed the presence of amyotrophic lateral sclerosis (ALS) and dementia. The causal relationship between psychotic symptoms and dementia on the one hand and ALS on the other hand is discussed. Probably in ALS other functional systems besides motor-neuron pathways are involved.