MR imaging findings
| Characteristic | Value |
|---|---|
| MR imaging scans (No. of patients) (%)a | |
| T1-weightedb | |
| Hyperintense lesions | 21 (34.4) |
| Hypointense lesions | 31 (50.8) |
| Hypointense center and hyperintense margin | |
| T2-weightedb | |
| Hyperintense lesions | 6 (9.8) |
| Hypointense lesions | 36 (59.0) |
| Heterogeneous lesions (hyperintense + hypointense) | 19 (31.1) |
| T1, perfusionc | |
| Slow and progressive ascending | 3 (100) |
| T2, perfusionc | |
| Decreased rCBV | 3 (100) |
| Spectroscopyc | |
| Decrease of NAA | 2 (100) |
| Increase of choline | 2 (100) |
| Increase of lipids | 2 (100) |
| Diffusion-weighted (No. of patients) (%)d | |
| Restricted diffusion | 9 (47.3) |
| Target sign | 1 (5.2) |
Note:—rCBV indicates relative CBV.
↵a Five patients did not have MR imaging scans and were eliminated from the calculations.
↵b The patient with the meningeal form was eliminated from the calculations.
↵c Only 3 patients underwent perfusion, and only 2 underwent spectroscopy.
↵d Five patients did not have diffusion and were eliminated from the calculations.