About 50% of individuals with NF1 have an affected parent and 50% havc thc altcrcd gcnc as thc rcsult of a new gene mutation.
Ciinical cvaiuation of both parents is warrantcd.
This should indude a mcdical bisiory and physical examination with particular attcntion to dcrmal and othcr fcatures of NF1. In addition, an ophthalmological cxamination (induding slit lamp examination) should be performed on both parents to look for Lisch nodules or othcr signs of NFI.