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).