[Clinical features of sex-linked recessive mental retardation with fragile X-chromosome].

The clinical description of 28 boys with recessive sex-linked mental retardation with an X-chromosome fracture is presented. The peculiarities of the relevant somatic and electrophysiological disturbances have been identified which in some cases make it possible to diagnose and in the remaining patients at least to suspect this disease before application of the cytogenetic methods of investigation. The authors also describe the characteristic psychopathological symptomatology manifested in peculiar schizophreniform disorders.