Fig. 2

Kaplan-Meier curves demonstrating unfavorable hemorrhage-free survival difference between bAVMs with and without certain morphologic features. a There was a significant difference between the time to unfavorable hemorrhage for patients with periventricular and non-periventricular bAVMs (log-rank, P = .002). b There was also a significant difference between the time to unfavorable hemorrhage for patients with temporal location and non-temporal bAVMs (log-rank, P = .03). c Children with non-temporal bAVMs tended to present unfavorable hemorrhage earlier than non-temporal lobe bAVMs (log-rank, P = .08). d The unfavorable-hemorrhage free survival was similar in children with or without one biomarker. In contrast, children harboring two or more biomarkers were at higher risk for early unfavorable hemorrhage (log-rank, P < .001). bAVMs were further classified into four types with these features. e Children with Type Ia and Ib lesions presented with unfavorable hemorrhage earlier than those with Type II lesions (log-rank, P < .001)