[Parkinson's disease and anosmia in monozygotic twin sisters (author's transl)].

Monozygotic twin sisters developed Parkinson's disease and anosmia at the age of 39. The disease was kept under control and regressed with L. Dopa. Two families with the same association had been previously reported. An anomaly of the metabolism of dopamine, genetically determined, is probably responsible for these disorders.