Relative frequencies of tumour biopsies in the main diagnostic groups for CNS tumours as compared to their frequencies in the whole of Sweden.

*according to the “classification scheme for childhood cancer” [47].**from the Swedish Childhood CNS Tumour Working Group (VCTB) [44].§Patients with tumours that can be due to inheritable diseases.13/11 patients had Giant cell astrocytoma with Tuberous Sclerosis, and 1/4 had Pilocytic astrocytoma with Neurofibromatosis type I.21/2 patients had Leptomeningeal oligodendromatosis.3this patient had Lumbar Schwannoma with Neurofibromatosis type II.