The autor is discussing and evaluating the terminology describing some rare or less common psychiatric disorders, e.g.. Ganser syndrom, Shared psychiatric disorder – Folie à deux, and Tic disorders with thein borderline areas. I tis an attempt to illustrate the less known or less often mentioned phenomena in various psychatric textbooks.

        Key words: Ganser syndrome, shared psychotic disorder (Folie à Deux), tic disorders.