<p> Summary of patients with IVOs and CNs</p><p>Follow-up Treatment Outcome No. Age Sex Location Histopathology time Resection Radiotherapy Chemotherapy 1 24 F Third ventricle IVO, WHO grade Ⅲ STR / / 3 days Death</p><p>2 20 M Left LV IVO, WHO grade Ⅱ GTR SRT / 58 months Good</p><p>3 26 M Third ventricle IVO, WHO grade Ⅲ GTR / / 24 months Recurrence, death</p><p>4 16 F Left LV IVO, WHO grade Ⅱ GTR / / 45 months Good</p><p>5 64 F Left LV IVO, WHO grade Ⅱ GTR / / 28 months Good</p><p>6 23 F Third ventricle IVO, WHO grade Ⅱ STR / / 2 months Recurrence, death</p><p>7 19 F Fourth ventricle IVO, WHO grade Ⅱ STR 3DCRT / 30 months Recurrence</p><p>8 40 F Fourth ventricle IVO, WHO grade Ⅱ GTR / Temozolomide 13 months Good</p><p>9 30 F Left LV CN, WHO grade Ⅱ / 3DCRT / 54 months Good</p><p>10 31 F Right LV CN, WHO grade Ⅱ / 3DCRT / 33 months Good</p><p>11 31 M Right LV CN, WHO grade Ⅱ / 3DCRT / 32 months Good</p><p>12 24 M Left LV CN, WHO grade Ⅱ * GTR 3DCRT / 26 months Recurrence</p><p>13 23 F Left LV CN, WHO grade Ⅱ GTR 3DCRT / 25 months Good</p><p>14 29 M Left LV CN, WHO grade Ⅱ GTR 3DCRT / 24 months Good</p><p>15 24 F Bilateral LVs CN, WHO grade Ⅱ GTR SRT / 25 months Good 16 43 F Right LV CN, WHO grade Ⅱ GTR 3DCRT / 24 months Good</p><p>17 51 M Left LV CN, WHO grade Ⅱ GTR / / 21 months Good</p><p>18 29 M Left LV CN, WHO grade Ⅱ GTR / / 6 months Good</p><p>19 32 F Left LV CN, WHO grade Ⅱ GTR 3DCRT / 2 months Good</p><p>20 23 M Left LV CN, WHO grade Ⅱ GTR 3DCRT / 18 months Good STR subtotal resection, LV lateral ventricle, GTR gross total resection, SRT stereotactic radiotherapy, 3DCRT three-dimensional conformal radiotherapy, * atypical CN</p>