MR imaging features by tumor group (all patients, n = 56)
| Group | P Value | All Patients | |||||
|---|---|---|---|---|---|---|---|
| PBL/ET | Non-ET | ||||||
| No. | % | No. | % | No. | % | ||
| Size (cm) | <.001 | ||||||
| Median | 3.6 | – | 6.2 | – | 4.3 | – | |
| Minimum | 1.1 | – | 2.7 | – | 1.1 | – | |
| Maximum | 9.1 | – | 9.3 | – | 9.3 | – | |
| % Enhancement | .17a, .080b | ||||||
| None | 1 | 2.7 | 0 | 0 | 1 | 1.8 | |
| 0–25 | 3 | 8.1 | 3 | 15.8 | 6 | 10.7 | |
| 25–75 | 6 | 16.2 | 7 | 36.8 | 13 | 23.2 | |
| >75 | 27 | 73.0 | 9 | 47.4 | 36 | 64.3 | |
| Margins | <.001 | ||||||
| Well-defined | 37 | 100.0 | 13 | 68.4 | 50 | 89.3 | |
| Ill-defined | 0 | 0 | 6 | 31.6 | 6 | 10.7 | |
| Presence of edema | <.001c | ||||||
| Absent | 32 | 86.5 | 5 | 26.3 | 37 | 66.1 | |
| <2 cm from tumor margin | 4 | 10.8 | 13 | 68.4 | 17 | 30.4 | |
| >2 cm from tumor margin | 1 | 2.7 | 1 | 5.3 | 2 | 3.6 | |
| Presence of cyst/necrosis | .22 | ||||||
| Absent | 12 | 32.4 | 3 | 15.8 | 15 | 26.8 | |
| Present | 25 | 67.6 | 16 | 84.2 | 41 | 73.2 | |
| Presence of calcification or hemorrhage | .26 | ||||||
| Absent | 16 | 43.2 | 5 | 26.3 | 21 | 37.5 | |
| Present | 21 | 56.8 | 14 | 73.7 | 35 | 62.5 | |
| DWI | – | ||||||
| Bright | 28 | 75.7 | 15 | 78.9 | 43 | 76.8 | |
| Dark | 1 | 2.7 | 0 | 0 | 1 | 1.8 | |
| Intermediate | 5 | 13.5 | 3 | 15.8 | 8 | 14.3 | |
| Artifact or not available | 3 | 8.1 | 1 | 5.3 | 4 | 7.1 | |
| Metastasis | – | ||||||
| Intracranial | 1 | 2.7 | 0 | 0 | 1 | 1.8 | |
| Spinal | 5 | 13.5 | 0 | 0 | 5 | 8.9 | |
| Intracranial and spinal | 6 | 16.2 | 0 | 0 | 6 | 10.7 | |
| None | 25 | 67.6 | 19 | 100.0 | 44 | 78.6 | |
| All patients | 37 | 100.0 | 19 | 100.0 | 56 | 100.0 | |