Table 2 Comparison of general information of study subjects
| Clinicopathological characteristic | Control group | IA group |
|---|---|---|
| n = 75 | n = 75 | |
| Age (year) | ||
| < 50 | 42 (56%) | 48 (64%) |
| ≥ 50 | 33 (44%) | 27 (36%) |
| Gender | ||
| Male | 43 (57%) | 46 (61%) |
| Female | 32 (43%) | 29 (39%) |
| Position | ||
| Communicans anterior | 0 | 31 (41%) |
| Communicans posterior | 0 | 18 (24%) |
| Cerebri media | 0 | 15 (20%) |
| Cerebri anterior | 0 | 11 (15%) |
| Shape | ||
| Cystiform | 0 | 39 (52%) |
| Fusiform | 0 | 11 (15%) |
| Interlayer | 0 | 13 (17%) |
| False | 0 | 12 (16%) |
| Number | ||
| Single | 0 | 65 (87%) |
| Multiple | 0 | 10 (13%) |
| Size | ||
| 0 < L + W ≤ 10 | 0 | 40 (53%) |
| 10 < L + W ≤ 30 | 0 | 35 (47%) |
