Evolution of MRI changes on follow-up brain imaging <1 year versus >1 yeara
| ≤365 Days | >365 Days | |
|---|---|---|
| No. | 37 | 23 |
| Median time to MRI (day) | 101 (range, 5–263) | 1136 (range, 382–3022) |
| No. with recurrent hemorrhage | 8 | 6 |
| T1 hyperintensity | 19/32 (59.4%) | 8/16 (50.0%) |
| T1 hyperintensity (moderate to significant) | 10/19 (56.2%) | 1/9 (11.1%) |
| Enhancement with gadolinium | 8/31 (25.8%) | 9/16 (56.2%) |
| Edema | 2/32 (6.2%) | 0 |
| DWI low intensity | 20/29 (68.9%) | 13/16 (81.2%) |
| ADC low intensity | 19/28 (67.9%) | 8/13 (61.5%) |
| Change to Zabramski type II or III lesions | 27/32 (84.4%) | 16/16 (100%) |
| Average size change (mm) (range) | Median, −1.4 (−24.7 to +1.1) | Median, −3.3 (−9.7 to +8.9) |
↵a Denominators noted are based on the availability of the particular MRI sequence.