An cytogenetical study was carried out for a 7 years old patient with mental retardation, eye and other multiple malformation. An extra G-positive band was found in the region of 9q12. The possible relationship between this aberration and the abnormal figures was discussed. An cytogenetical study was carried out for a 7 years old patient with mental retardation, eye and other multiple malformation. An extra G-positive band was found in the region of 9q12. The possible relationship between this aberration and the abnormal figures was discussed.