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Table 3: 
Evolution of MRI changes on follow-up brain imaging <1 year versus >1 yeara
≤365 Days>365 Days
No.3723
Median time to MRI (day)101 (range, 5–263)1136 (range, 382–3022)
No. with recurrent hemorrhage86
T1 hyperintensity19/32 (59.4%)8/16 (50.0%)
T1 hyperintensity (moderate to significant)10/19 (56.2%)1/9 (11.1%)
Enhancement with gadolinium8/31 (25.8%)9/16 (56.2%)
Edema2/32 (6.2%)0
DWI low intensity20/29 (68.9%)13/16 (81.2%)
ADC low intensity19/28 (67.9%)8/13 (61.5%)
Change to Zabramski type II or III lesions27/32 (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.