[Discordant evolution in monozygotic twins with familial nephropathy].

Two monozygotic twin sisters presented a familial nephropathy, discovered at 5 years of age. The clinical course was quite different for each patient: end-stage renal failure occurred at 5.5 years of age for one and at 14 years for the other. This difference raises the hypothesis of the role of environmental factors on the clinical expression of an inherited disease.