Locations of primary tumors with respect to molecular groups
| Subgroup | Fourth Ventricle | CPA (n = 6) (%) | Paraventricular (n = 12) (%) | Cerebellar Periphery (n = 19) (%) | ||||
|---|---|---|---|---|---|---|---|---|
| No. (n = 119) (%) | Midline-Vermis (n = 40) (%) | 4th-uniCPA (n = 25) (%) | 4th-biCPA (n = 17) (%) | Subtotal (n = 81) (%) | ||||
| WNT | 15 (12.6) | 5 (12.5) | 3 (12) | 1 (5.9) | 8 (9.9) | 3 (50) | 3 (25) | 0 (0) |
| SHH | 26 (21.8) | 3 (7.5) | 0 (0) | 0 (0) | 3 (3.7) | 3 (50) | 2 (16.7) | 18 (94.7) |
| Group 3 | 29 (24.4) | 11 (27.5) | 8 (32) | 6 (35.3) | 25 (30.9) | 0 (0) | 4 (33.3) | 0 (0) |
| Group 4 | 49 (41.2) | 21 (52.5) | 14 (56) | 10 (58.8) | 45 (55.5) | 0 (0) | 3 (25) | 1 (5.3) |
Note:—4th-uniCPA indicates fourth ventricle with unilateral extension along the lateral recess toward the CPA; 4th-biCPA, fourth ventricle with bilateral extension along bilateral recesses toward the CPAs.