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TABLE 4: Lesion characteristics on DW MR images of the brain
Characteristic Lesion
Ipsilateral Preprocedural Contralateral Postprocedural Ipsilateral Contralateral
Procedures with lesions^* 10 (14 [7, 25]) 1 (1 [0, 7]) 20 (29 [19, 41]) 6 (9 [4, 17])
No. of lesions 
 Total 24 1 52 7
 Average 2.4 NA 2.6 1.2
 Range 1–6 NA 1–8 1–2
Size 
 <5 mm 10 (42) 0 (0) 36 (69) 6 (86)
 5–10 mm 7 (29) 0 (0) 11 (21) 0 (0)
 >10 mm 7 (29) 1 (100) 5 (10) 1 (14)
Location 
 Vertical distribution 
  Upper area of brain 15 (63) 1 (100) 27 (52) 4 (57)
  Middle area of brain 9 (38) 0 (0) 20 (39) 3 (43)
  Lower area of brain 0 (0) 0 (0) 5 (10) 0 (0)
 Horizontal distribution 
  Cortical or subcortical area 24 (1000) 1 (100) 50 (96) 6 (86)
  Deep area 0 (0) 0 (0) 2 (4) 1 (14)
 Cerebral distribution 
  Frontal lobe 0 (0) 0 (0) 4 (8) 3 (43)
  Parietal lobe 23 (96) 1 (100) 38 (73) 2 (29)
  Temporal lobe 1 (4) 0 (0) 5 (10) 0 (0)
  Occipital lobe 0 (0) 0 (0) 3 (6) 1 (14)
  Basal ganglia 0 (0) 0 (0) 1 (2) 0 (0)
  Thalamus 0 (0) 0 (0) 1 (2) 1 (14)
Vascular distribution^† 
 ACA cortical branches 1 (4) 1 (100) 5 (10) 2 (29)
 ACA deep branches 0 (0) 0 (0) 1 (2) 0 (0)
 MCA cortical branches 23 (96) 0 (0) 42 (82) 3 (43)
 MCA deep branches 0 (0) 0 (0) 0 (0) 0 (0)
 PCA cortical branches 0 (0) 0 (0) 3 (6) 1 (14)
 PCA deep branches 0 (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.