NF1 and neoplasm: We also revealed subgroups with fewer interventions - indicating a more favorable course of disease, i.e. older age (1-711/12 years and ≥ 8 years), tumor location in the cerebral hemispheres, the cerebellum and the lateral ventricles, histology of neuronal and mixed neuronal-glial tumors or LGG-NOS, and patients with NF-1.