Table 2. Comparison of conventional MRI features between AM and ATM.
| Parameters | AM (n=30) | ATM (n=35) | P |
|---|---|---|---|
| Location | 0.786 | ||
| Falx or parasagittal | 11 | 12 | |
| Convexity | 8 | 10 | |
| Skull base | 7 | 5 | |
| Posterior fossa | 3 | 5 | |
| Others | 1 | 3 | |
| Lobulation | 0.588 | ||
| Yes | 16 | 21 | |
| No | 14 | 14 | |
| Necrosis/cystic changes | 0.128 | ||
| Yes | 9 | 17 | |
| No | 21 | 18 | |
| Peritumoral edema | 0.878 | ||
| Yes | 16 | 18 | |
| No | 14 | 17 | |
| Tumor brain interface | 0.229 | ||
| Clear | 23 | 22 | |
| Unclear | 7 | 13 | |
| Dural tail sign | 0.780 | ||
| Yes | 24 | 27 | |
| No | 6 | 8 | |
| Adjacent skull changes | 0.229 | ||
| Yes | 7 | 13 | |
| No | 23 | 22 | |
| Vascular flow signal | 0.816 | ||
| Yes | 18 | 20 | |
| No | 12 | 15 | |
| Enhancement pattern | 0.878 | ||
| Inhomogeneous | 14 | 17 | |
| Homogeneous | 16 | 18 |
AM, angiomatous meningioma; ATM, atypical meningioma; MRI, magnetic resonance imaging.