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Table 4: New lesions on MRI/DWI posttreatment and in between treatments (type of lesion, number, size, and location)
Posttreatment Between post- and next pretreatment MRI
Number Location Size Number Number Location Total lesions
Ischemic (i) 23 (6 - ai) 4 C <4 7 1 PN 24
1 SC 4–10 7 
3 BGL 11–20 5 
9 PN >20 4 
1 WM 
5 C-bell 
Venous 8 8 PN <4 5 13^* 9 C 21
Thrombosis/clots (vt) 4–10 3 3 deep.v 
1 PN 
Uncertain 4 4 PN <4 3 4
(i or vt) 4–10 1 
ICH 4 1 PN <10 1 2 6
1 C 10–20 2 
1 SC >20 1 
1 BGL 
Vasogenic edema 4 (→2 ICH) (<10 2) 1^** PN/SC 5
(10–20 2) 
Total 43 17 (4 patients) 60/60 
Note:—ICH indicates intracerebral hematoma; ai, lesions related to catheterization during the diagnostic part of the procedure; C, cortical; SC, subcortical; BGL, basal ganglia; PN, perinidal (close to the nidus); WM, white matter; C-bell, cerebellar hemisphere; Deep, deep veins.
* Progressive venous thrombosis >2 weeks after treatment.
** Developed vasogenic edema because of combined thrombosis of a feeding artery, the nidus, and vein (represented as 1/13 vt above).