[Goldenhar syndrome. Discordance in monozygotic twins].

Child here described is a new-born male, the firstborn twin, who showed clinical-radiological manifestations compatible with an oculo-auriculo-vertebral syndrome or Goldenhar's syndrome. A comparison of chromosomes, identification of serological types and determination of antigens of histocompatibility (HLA) showed them to be similar in both twins, thus showing identity of monozygots . Of great importance in the anamnesis is a radiological study--cholecystography--which was practiced between 4th and 6th weeks of pregnancy. Differences shown and possible intervention of radiation as etiology mark the especial interest of this case.