Fig. 2

a Schematic illustration of tumor locations and each number. Thalamus: 47, Brainstem: 24, Spinal cord: 12, Others: 10. b Distribution of patients’ age and sex. There are 26 cases (≤ 18 years) (28%), 60 cases (64%) (19–69 years) and 7 cases (≥ 70 years) (8%)