[Monozygotic and dizygotic twins discordant with regard to manifest schizophrenia].

The author describes psychotic conditions of co-twins who were not seen by a psychiatrist before, in 12 MZ and 62DZ pairs, where the probands suffered from manifest schizophrenia. Among MZ, one half of the examined patients was classified as "mildly expressed schizophrenia" and the other as schizoid personality abnormalities. The probands of MZ pairs displayed the prevalence of slow progressive variants of schizophrenia within the framework of both continuous and attack-like forms. DZ co-twins of schizophrenic probands according to the psychotic state formed a range of transitions from mildly expressed schizophrenia through personality abnormalities to accentuated personalities and norm.