TABLE 4:

Lesion characteristics on DW MR images of the brain

CharacteristicLesion
Ipsilateral PreproceduralContralateral PostproceduralIpsilateralContralateral
Procedures with lesions*10 (14 [7, 25])1 (1 [0, 7])20 (29 [19, 41])6 (9 [4, 17])
No. of lesions
 Total241527
 Average2.4NA2.61.2
 Range1–6NA1–81–2
Size
 <5 mm10 (42)0 (0)36 (69)6 (86)
 5–10 mm7 (29)0 (0)11 (21)0 (0)
 >10 mm7 (29)1 (100)5 (10)1 (14)
Location
 Vertical distribution
  Upper area of brain15 (63)1 (100)27 (52)4 (57)
  Middle area of brain9 (38)0 (0)20 (39)3 (43)
  Lower area of brain0 (0)0 (0)5 (10)0 (0)
 Horizontal distribution
  Cortical or subcortical area24 (1000)1 (100)50 (96)6 (86)
  Deep area0 (0)0 (0)2 (4)1 (14)
 Cerebral distribution
  Frontal lobe0 (0)0 (0)4 (8)3 (43)
  Parietal lobe23 (96)1 (100)38 (73)2 (29)
  Temporal lobe1 (4)0 (0)5 (10)0 (0)
  Occipital lobe0 (0)0 (0)3 (6)1 (14)
  Basal ganglia0 (0)0 (0)1 (2)0 (0)
  Thalamus0 (0)0 (0)1 (2)1 (14)
Vascular distribution
 ACA cortical branches1 (4)1 (100)5 (10)2 (29)
 ACA deep branches0 (0)0 (0)1 (2)0 (0)
 MCA cortical branches23 (96)0 (0)42 (82)3 (43)
 MCA deep branches0 (0)0 (0)0 (0)0 (0)
 PCA cortical branches0 (0)0 (0)3 (6)1 (14)
 PCA deep branches0 (0)0 (0)1 (2)1 (14)
  • Note.—Total of procedures was 70. Data in parentheses are percentages, unless otherwise specified. NA indicates not applicable.

  • * Data in brackets are the 95% confidence intervals.

  • PCA indicates posterior cerebral artery.