Intrafamilial phenotype variation in Friedreich's disease: possible exceptions to diagnostic criteria.

Abstract excerpt

Three families are described which include members with "typical" Friedreich's disease (FD) and others who are ataxic but do not satisfy all the diagnostic criteria for that disease. In family A two patients have an early-onset, rapidly progressive FD, while two others have a late-onset, more benign form. In families B and C one member has "typical" FD, and another has a similar ataxic syndrome, except for...

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