[The delusional elderly patient, a challenge for caregivers].

: A delusion is any misconception which goes against all evidence to the contrary, whether it be an inaugural delusion or whether it occurs with the development of dementia. Chronic delusions are distinct from acute delusional expressions, of greater or lesser conviction, which are seen as symptomatic productions in dementia patients and are sometimes the result of depression. Caregivers should be aware of these diseases.