Table 1.
Clinical information of patients
| Parameter | Low-grade meningiomas (Grade I) | High-grade meningiomas (Grade II and III) |
|---|---|---|
| Number of patients | 1560 | 986 |
| Mean age (years) | 47.8 ± 12.3 | 55.2 ± 13.6 |
| Gender distribution | 52% male, 48% female | 58% male, 42% female |
| Mean tumor size (cm) | 2.7 ± 1.1 | 3.4 ± 1.3 |
| Tumor location | Parietal: 30%, frontal: 25%, temporal: 20%, other: 25% | Parietal: 40%, frontal: 30%, temporal: 15%, other: 15% |
| MRI scans used | T1, contrast-enhanced, T2 | T1, contrast-enhanced, T2 |
| Mean follow-up (months) | 22.5 ± 10.2 | 18.9 ± 9.8 |
| Preoperative symptoms | Headache: 45%, seizures: 25%, no symptoms: 30% | Headache: 60%, seizures: 35%, no symptoms: 5% |
| Clinical outcome | No recurrence: 88%, recurrence: 12% | No recurrence: 64%, recurrence: 36% |
| Surgical approach | Craniotomy: 90%, endoscopic: 10% | Craniotomy: 85%, endoscopic: 15% |
| Histopathological features | Mitosis: 3 ± 1 per 10 HPF, brain invasion: 10% | Mitosis: 12 ± 3 per 10 HPF, brain invasion: 35% |
| Mean tumor volume (cm3) | 30.2 ± 15.3 | 45.7 ± 20.1 |
| Radiotherapy post-surgery | 10% | 40% |
| Recurrence time (months) | 24.5 ± 5.3 | 18.2 ± 4.8 |