a well-structured delusion, characterized by the presence of a certain system of delusional constructions, while individual delusional constructions are interrelated. In these cases, the patient provides a whole system of detailed and interrelated evidence for his statements, a lot of specific facts, dates, people whom he suspects, and other circumstances. It usually indicates a long, gradual development of delirium. Mainly abstract cognition of the world surrounding the patient is disturbed, the perception of internal connections between various phenomena and events is distorted.