Table 1.
Imaging features of meningeal Ewing sarcoma/peripheral primitive neuroectodermal tumours
| Imaging features | Cases (n) | Proportion (%) |
|---|---|---|
| Fusiform shaped | 7 | 87.5 |
| CT appearance | ||
| Mixed slightly high density | 5 | 62.5 |
| Mixed iso–low density | 3 | 37.5 |
| MR appearance | ||
| Mixed isointense-to-hypointense signal on T1WI | 6 | 75.0 |
| Mixed hypointense signal on T1WI | 2 | 25.0 |
| Mixed isointense-to-hyperintense on T2WI | 8 | 100.0 |
| Degree of enhancement | ||
| Significantly heterogeneous enhancement | 8 | 100.0 |
| Cystic degeneration and necrosis | 8 | 100.0 |
| Short and nodular dural tail | 3 | 37.5 |
| Peritumoral oedema | ||
| Mild | 3 | 37.5 |
| No significant | 5 | 62.5 |
| Connected to the dura with a wide base | 7 | 87.5 |
| Adjacent skull erosion and osteolysis | 5 | 62.5 |
T1WI, T1 weighted imaging; T2WI, T2 weighted imaging.