From this group should be excluded the deteriorating paranoic states and paranoic states symptomatic of other mental disorders or of some damaging factor such as alcohol, organic brain disease, etc.

The group comprises cases which show clinically fixed suspicions, persecutory delusions, dominant ideas or grandiose trends logically elaborated and with due regard for reality after once a false interpretation or premise has been accepted. Further characteristics are formally correct conduct, adequate emotional reactions, clearness and coherence of the train of thought.