ERBB4 and Intellectual disability: There are a few patients whose microdeletion do not affect the now discussed region in our patient, like the microdeletion spanning ERBB4 that is located more distally in 2q34 in a patient with intellectual disability and hyperactivity (Kasnauskiene et al., 2013) or patients with the proximal microdeletion 2q32q33 and severe mental retardation (Van Buggenhout et al., 2005).