[Hallgren's syndrome in one family: retinitis pigmentosa, congenital deafness and ataxia].

A family of 6 siblings, 4 of which have Hallgren's syndrome, i.e., retinitis pigmentosa, congenital deafness and ataxia is described. Hallgren's series in Sweden is referred to. This affection was ascribed by Hallgren to a single gene with almost complete penetrance. However, 3 brothers of the present series show neurological anomalies not present in the Swedish cases.