Table 4.
Surgical details and the results of the 1,033 intramedullary tumor cases
| Characteristic | Value |
|---|---|
| Surgical approaches | |
| Posterior | 1,023 (99.0) |
| Anterior | 10 (1.0) |
| Surgeons’ experience | |
| > 10 years | 976 (94.5) |
| < 10 years | 57 (5.5) |
| Main operator | |
| Board-certified spine surgeons | 912 (88.3) |
| Operation time (min) | 399.9 ± 173.2 |
| Blood loss (mL) | 186.0 ± 247.0 |
| Degrees of removal | |
| Total | 672 (65.1) |
| Subtotal | 134 (13.0) |
| Partial | 146 (14.1) |
| Biopsy | 81 (7.8) |
| Total removals | |
| Ependymoma | 270/361 (74.8) |
| Hemangioblastoma | 180/196 (91.8) |
| Cavernous malformations | 142/160 (88.8) |
| Astrocytoma | 18/168 (10.7) |
| Others | 54/126 (42.9) |
| Postoperative radiation | |
| Local | 117 (11.3) |
| Whole spine | 13 (1.3) |
| Chemotherapy | |
| Temozolomide only | 57 (5.5) |
| Temozolomide and bevacizumab | 24 (2.3) |
Values are presented as number (%) or mean±standard deviation.