Table 1. Characteristics of the study population.
| Characteristics | Values | |
|---|---|---|
| No. of patients (%) | 68 (100.0) | |
| Median age, yr | 42.5 (14–83) | |
| Sex (%) | ||
| Female | 42 (61.8) | |
| Male | 26 (38.2) | |
| Approach (%) | ||
| Retrosigmoid | 66 (97.1) | |
| Translabyrinthine | 2 (2.9) | |
| Location of residual tumors (%) | ||
| IAC | 7 (10.3) | |
| CPA | 6 (8.8) | |
| IAC and CPA | 55 (80.9) | |
| Multiple microsurgeries before GKRS (%) | 4 (5.9) | |
| Obstructive HCP after surgery (%) | 3 (4.4) | |
| Median preoperative tumor volumea, cm3 | 15.4 (3.2–40.9) | |
| GKRS treatment features | ||
| Median residual TV, cm3 | 2.5 (0.3–27.4) | |
| Median time to GKRS after surgery, mon | 4.2 (0.7–16.2) | |
| Median prescription marginal dose, Gy | 12.5 (10.0–20.0) | |
| Median prescription isodose, % | 50 (20.0–50.0) | |
| Median follow-up period after GKRS, mon | 64 (25.7–152.4) | |
Values are presented as number of patients (%) or median (range).
IAC = internal auditory canal, CPA = cerebellopontine angle, GKRS = gamma knife radiosurgery, HCP = hydrocephalus, TV = tumor volume.
aDue to the loss of old imaging data, preoperative tumor volume was measured in 65 patients.