NF1 and attention deficit-hyperactivity disorder: Additionally, there are reports of considerable diagnostic overlap between NF1 and both attention-deficit/hyperactivity disorder (ADHD) and autism spectrum disorder (Eijk et al., 2018; Garg et al., 2013; Hyman et al., 2005; Lehtonen et al., 2013; Plasschaert et al., 2015; Torres Nupan et al., 2017).