Histopathologic and cMRI features of the tumors
| Grade II Oligoastrocytomas (n = 14) | Grade II Oligodendrogliomas (n = 10) | All Grade II (n = 24) | Grade III Oligoastrocytomas (n = 14) | Grade III Oligodendrogliomas (n = 12) | All Grade III (n = 26) | Total (n = 50) | |
|---|---|---|---|---|---|---|---|
| Contrast enhancement | |||||||
| Absent | 8 | 7 | 15 (62.5%) | 2 | 1 | 3 (11.5%) | 18 (36%) |
| Blurry | 6 | 2 | 8 (33.3%) | 6 | 5 | 11 (42.4%) | 19 (38%) |
| Nodular | 0 | 1 | 1 (4.2%) | 4 | 1 | 5 (19.2%) | 6 (12%) |
| Ringlike | 0 | 0 | 0 (0%) | 2 | 5 | 7 (26.9%) | 7 (14%) |
| Location | |||||||
| Frontal | 3 | 3 | 6 (25%) | 6 | 6 | 12 (46.2%) | 18 (36%) |
| Temporal | 1 | 2 | 3 (12.5%) | 3 | 3 | 6 (23.1%) | 9 (18%) |
| Insular | 2 | 4 | 6 (25%) | 3 | 2 | 5 (19.2%) | 11 (22%) |
| Temporoinsular | 7 | 1 | 8 (33.3%) | 1 | 1 | 2 (7.7%) | 10 (20%) |
| Parietal | 1 | 0 | 1 (4.2%) | 0 | 0 | 0 (0%) | 1 (2%) |
| Thalamic | 0 | 0 | 0 (0%) | 1 | 0 | 1 (3.8%) | 1 (2%) |
| Tumor borders | |||||||
| Sharp | 6 | 3 | 9 (37.5%) | 5 | 4 | 9 (34.6%) | 18 (36%) |
| Indistinct | 8 | 7 | 15 (62.5%) | 9 | 8 | 17 (65.4%) | 32 (64%) |
| Edema | |||||||
| Yes | 9 | 8 | 17 (70.9%) | 9 | 7 | 16 (61.5%) | 33 (66%) |
| No | 5 | 2 | 7 (29.1%) | 5 | 5 | 10 (38.5%) | 17 (34%) |
| Necrosis | |||||||
| Yes | 8 | 4 | 12 (50%) | 6 | 9 | 15 (57.7%) | 27 (54%) |
| No | 6 | 6 | 12 (50%) | 8 | 3 | 11 (42.3%) | 23 (46%) |
| Hemorrhage | |||||||
| Yes | 0 | 0 | 0 (0%) | 1 | 4 | 5 (19.2%) | 5 (10%) |
| No | 14 | 10 | 24 (100%) | 13 | 8 | 21 (80.8%) | 45 (90%) |
| 1p/19q loss | |||||||
| Yes | 4 | 9 | 13 (54.2%) | 0 | 6 | 6 (23.1%) | 19 (38%) |
| No | 10 | 1 | 11 (45.8%) | 14 | 6 | 20 (76.9%) | 31 (62%) |