“…ENB can occur in all ages, with peaks in the 2nd and 6th decades of life [1,5]. Generally, ENB is relatively rare in children [4,14,27,31]. The incidence in children up to 15 years is < 0.1 per 100,000 children (personal communication Dr. P. Kaatsch, German Childhood Cancer Registry, University of Mainz, Germany).…”