Complications of embolization with Onyx in 6 of 44 patients

Sex/Age (y)	AVM Location and Size	Estimated Size Reduction (%)	Complication	Additional Therapy	Outcome, GOS
M/31	Right temporal, 3.5 cm	95	Hemorrhage 3 d after embolization	Acute surgical removal of hematoma and AVM	No deficit at 3 mo, GOS 5
M/44	Left temporal 3.5 cm	80	Partial occlusion M2 by reflux	Radiosurgery	Transient dysphasia, GOS 5
M/51	Right frontoparietal, 4.5 cm	50	Hemorrhage during embolization		Death, GOS 1
M/60	Left parietal, 5 cm	90	Reflux in distal ACA branch	Radiosurgery	Transient paresis right leg, GOS 5
M/27	Right parieto-occipital, 4 cm	90	Hemorrhage 3 h after embolization	Acute surgical removal of hematoma and AVM	Quadrantanopsia, GOS 4
F/44	Right partietal, 7 cm	40	Reflux in distal ACA branch	Refused	Distal paresis left leg, GOS 4

AVM indicates arteriovenous malformation; ACA, anterior cerebral artery; GOS = Glasgow Outcome Score; M2, second segment of middle cerebral artery.