Table 2. Meningioma characteristics, resection rates & surgical parameters for 213 keyhole operations.
| Endonasal (n = 74) | Supraorbital (n = 73) | Mini-pterional (n = 20) | Retromastoid (n = 38) | Suboccipital (n = 4) | Transfalcine (n = 4) | Total (n = 213) | |
|---|---|---|---|---|---|---|---|
| GTR | 17 (23%) | 34 (46.6%) | 10 (50%) | 19 (50%) | 2 (50%) | 3 (75%) | 85 (40%) |
| GTR/NTR | 22 (29.7%) | 54 (74%) | 14 (70%) | 28 (73.7%) | 3 (75%) | 4 (100%) | 125 (58.7%) |
| Redo Surgery (had prior surgery) | 24 (32.4%) | 16 (21.9%) | 3 (15%) | 3 (7.9%) | 1 (25%) | 0 | 47 (22.1%) |
| Invasion to CS/MC/Orbit /ITF | 40 (54%) | 15 (21%) | 10 (50%) | 9 (24%) | 0 | 0 | 74 (35%) |
| Median Skull Base Compartments Occupied | 2 | 2 | 2 | 2 | 1 | 1 | 2 |
| Mean Max Tumor Diameter (mm) | 29.1 ± 13.2 | 28.5 ± 13.0 | 29.7 ± 14.1 | 32.1 ± 13.5 | 26.5 ± 12.5 | 40.0 ± 21.2 | 29.7 ± 13.4 |
| Use of Endoscopy | 74 (100%) | 54/73 (74%) | 5/20 (25%) | 21/38 (55%) | 3/4 (75%) | 4/4 (100%) | 161/213 (76%) |
| New/Worsened FLAIR/T2 Changes (mean diam, mm) | 2/74 | 11/73 | 4/20 | 18/48 | 1/4 | 0/4 | 36/213 |
| 2.7% | 15.1% | 20.0% | 37.5% | 25% | 0 | (16.9%) | |
| (2.5mm) | (6.9 mm) | (9.5 mm) | (8.1 mm) | (11 mm) | (NA) | (7.67 mm) | |
| Persistent FLAIR Changes at 3 months or more postop | 1/74 (1.4%) | 2/73 (2.7%) | 2/20 (10%) | 6/48 (12.5%) | 0 | 0 | 11/213 (5.2%) |
| Median LOS | 3 | 3 | 2 | 2 | 3 | 2 | 3 |
Abbreviations: GTR: gross total resection, NTR: near total resection, CS: cavernous Sinus, MC: Meckel’s cave. LOS: length of stay, Max: maximum