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Table 1: 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%)