Table 2.
Characteristic differences between no growth and regrowth group following incomplete surgical resection for vestibular schwannomas.
| No growth | Regrowth | P | |
|---|---|---|---|
| Patients | 44 | 9 | |
| Age (years)* | 50 ± 13.6 | 49.7 ± 11.2 | 0.820 |
| Sex, M/F | 13/31 | 4/5 | 0.445 |
| Tumor size (cm)* | |||
| Length | 3.3 ± 1.2 | 4 ± 1 | 0.064 |
| Width | 2.6 ± 0.9 | 2.9 ± 0.9 | 0.312 |
| Height | 2.5 ± 0.9 | 3.1 ± 0.8 | 0.064 |
| Koos grade | NA | ||
| III | 15 (34.1) | 0 (0) | |
| IV | 29 (65.9) | 9 (100) | |
| Tumor character | 0.706 | ||
| Solid | 29 (65.9) | 5 (55.6) | |
| Cystic | 15 (43.1) | 4 (44.4) | |
| Preoperative HB grade | NA | ||
| I–II | 42 (95.5) | 9 (100) | |
| III–V | 2 (4.5) | 0 (0) | |
| Preoperative tumor volume (cm3) | 12.2 ± 9.9 | 18.5 ± 12.3 | 0.128 |
| Extent of resection | 0.684 | ||
| NTR | 33 (75) | 6 (66.7) | |
| STR + PR | 11 (25) | 3 (33.3) | |
| Extent of resection (%)* | 96 ± 4.9 | 95.2 ± 5.2 | 0.903 |
| Immediate postoperative tumor volume (cm3) | 0.030 | ||
| < 0.7 | 42 (95.5) | 6 (66.7) | |
| ≥ 0.7 | 2 (4.5) | 3 (33.3) | |
| Site of residual tumor | 0.035 | ||
| IAC | 39 (88.6) | 5 (55.6) | |
| CPA | 5 (11.4) | 4 (44.4) | |
| Postoperative HB grade | 0.665 | ||
| I–II | 33 (75) | 8 (88.9) | |
| III–V | 11 (25) | 1 (11.1) | |
CPA cerebello-pontine angle, HB House-Brackmann, IAC internal auditory canal, NA not applicable, NTR near-total resection, PR partial resection, STR subtotal resection.
*Values shown are mean ± SD.