Table 4. Potential diagnostic and therapeutic impact of 2nd MRI.
| Impact of MRI | N (%) |
|---|---|
| Diagnostic knowledge with 2nd MRI | |
| Better | 49 (71%) |
| Same | 8 (12%) |
| Worse | 12 (17%) |
| Diagnostic value of 2nd MRI | |
| Confusing or incorrect – extra studies required | 0 (0%) |
| Confusing or incorrect – no extra studies | 14 (20%) |
| No change in treatment plan | 6 (9%) |
| No change in treatment plan – increased diagnostic confidence | 36 (52%) |
| Could have caused change in treatment plan | 10 (15%) |
| Caused change in the treatment plan | 3 (4%) |
| Diagnostic confidence of 2nd MRI | |
| Without 2nd MRI (mean (s.d.)) | 5.8 (1.8) |
| With 2nd MRI (mean (s.d.)) | 7.9 (2.0)* |
| Therapeutic impact of 2nd MRI | |
| WLE possible based on surgery | 22/69 |
| MRI agrees with conventional assessment, WLE possible | 10 (45%) |
| MRI agrees with conventional assessment, WLE NOT possible | 5 (23%) |
| MRI disagrees with conventional assessment, suggests WLE possible | 5 (23%) |
| MRI disagrees with conventional assessment, suggests WLE NOT possible | 2 (9%) |
| WLE NOT possible based on surgery | 47/69 |
| MRI agrees with conventional assessment, WLE possible | 4 (9%) |
| MRI agrees with conventional assessment, WLE NOT possible | 35 (75%) |
| MRI disagrees with conventional assessment, suggests WLE possible | 4 (9%) |
| MRI disagrees with conventional assessment, suggests WLE NOT possible | 4 (9%) |
*
P<0.01, paired samples t-test for the difference in confidence pre- and post-2nd MRI.