Table 1.
Baseline Characteristics of the Study Population: Characteristics of the Study Population Are Described Using Means ± SD or Median and Range for Continuous Variables, Number of Cases With Relative Percentages Reported in Parentheses for Categorical Variables
| Variables | Value (No. and %, mean ± SD or median and range) |
|---|---|
| No. of patients | 267 |
| Sex | |
| Female | 155 (58.05%) |
| Male | 112 (41.95%) |
| Age | 39.19 yr (18-71) |
| Tumor side | |
| Left | 119 (44.57%) |
| Right | 148 (55.43%) |
| Tumor site | |
| Frontal | 140 (52.44%) |
| Insular | 50 (18.73%) |
| Temporal | 41 (15.35%) |
| Parietal | 29 (10.86%) |
| Cingulate gyrus | 2 (0.75%) |
| Occipital | 3 (1.12%) |
| Other (thalamus and parietal-occipital) | 2 (0.75%) |
| Type of surgery | |
| Awake | 174 (65.17%) |
| General anesthesia | 93 (34.83%) |
| Preoperative tumoral volume computed on 3D T2-FLAIR MRI images, cm3 (data available in 258 cases) | 15 (1-189) |
| Preoperative tumor volume Subgroups | |
| <=15 cm3 | 136 (86.07%) |
| 15-30 cm3 | 56 (35.44%) |
| >=30 cm3 | 66 (41.77%) |
| Preoperative KPS | 97.7 (50-100) |
| Postoperative RTV computed on 3D T2-FLAIR MRI images, cm3 (data available in 258 cases) | 0 (0-87) |
| Postoperative RTV =0 cm3 | 159 (61.62%) |
| Postoperative RTV <=5 cm3 | 66 (25.58%) |
| Postoperative RTV >6 cm3 | 33 (12.80%) |
| EOR % (EOR data are available in 258 cases) | 61.87 % (50-supratotal) |
| EOR >100% (supratotal) | 24 (9.3%) |
| EOR = 100% | 135 (52.32%) |
| EOR < 100% | 99(38.38%) |
| Molecular class (data available in 232 cases) | |
| Diffuse astrocytoma IDH1/2 mutated | 83 (35.78%) |
| Diffuse astrocytoma IDH1/2 wild-type | 34 (14.65%) |
| Oligodendroglioma | 115 (49.57%) |
| Time between diagnosis and surgery (mo) | 22 (1-170) |
| Hospitalization length (days) | 4 (1-12) |
| Median follow-up after surgery (mo) | 88 (6-258) |
| Reason to perform MRI | |
| Headache | 89 (33.33%) |
| Head trauma | 35 (13.10%) |
| Other medical reasons included unrelated neurological deficits | 69 (25.84%) |
| Otolaryngology disorders | 49 (18.35%) |
| MRI follow-up for other neurosurgical pathologies | 13 (4.87%) |
| MRI research studies | 9 (3.37%) |
| NA | 3 (1.12%) |
| Time between first and second surgery (yr) | 5.5 |
Abbreviations: EOR, extent of resection; IDH, isocitrate dehydrogenase; MRI, magnetic resonance imaging; NA, not applicable; No., number of patients; RTV, residual tumor volume.