MR imaging findings (n = 64)
| Group | Normal | Watershed Area Involvement | Basal Ganglia Involvement | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cortical Swelling | Cortical and White Matter or Cortical and Subcirtical T2/PD*† | Cortical T1† | Cortical T2‡ | Clear Atrophy | Doubtful or Pseudoatrophy | Fuzzy | T2† | T2‡ | T1† | T2‡ | ||
| 1§ | 1 (B) | 12 (A–C) | 31 (A–E) | 13 (B–D) | 20 (A–D) | 7 (C, D) | 5 (C, D) | 10 (A–E) | 18 (A–E) | 10 (A–D) | 4 (A–C) | 4 (C, D) |
| 2| | 2 (B, C) | 9 (A–D) | 26 (A–E) | NA | 2 (B, C) | 6 (D, E) | 10 (B–D) | 16 (A–D) | 22 (A–E) | NA | 1 (C) | 3 (C, D) |
Note.—A indicates lesion observed on days 1–3; B, lesion observed on days 4–7; C, lesion observed on days 8–15; D, lesion observed on days 16–50; E, lesion observed after day 50; NA, not applicable; T1, T1-weighted imaging; T2, T2-weighted imaging; PD proton density–weighted imaging.
* Cortical and white matter for group 1, cortical and subcortical for group 2.
† Lesion was hyperintense compared with normal brain tissue.
‡ Lesion was hypointense compared with normal brain tissue.
§ Twenty patients, 33 MR imaging findings, <1 year.
| Twenty patients, 31 MR imaging findings, >1 year.