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TABLE 2: 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.