Table 1. Diagnostic criteria for NF1.* Confirmed when two or more of the described features are present. *NIH Criteria. Neurofibromatosis: Conference Statement. Arch Neurol. 1988;45 (5):575–578. doi:10.1001/ archneur.1988.00520290115023 NF1 is a common, if not the most common, autosomal dominant condition, with an estimated prevalence of 1/1,900–1/3,500 people.1 The condition is fully penetrant but with a wide range of expressivity, from mild to severe, even within the same family.
