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FIG 5. 3D bar chart to show changes in risk of rupture for intranidal vessels i21 (dark columns) and i37 (light columns), both of which were found to rupture after extranidal rerouting of pressure consequent to partial embolization via AF1 (mechanism 2, as in fig 2). B to E represent extent of progressive nidus occlusion as depicted in figure 2. Note that both vessels rupture (risk >100%) at systemic normotension (74 mm Hg). The reduction in risk of rupture occurs with moderate systemic hypotension (50 mm Hg) and is more pronounced at profound systemic hypotension (25 mm Hg)
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