Table 2.

ICA defect closure approach depending on the degree of collateral circulation.

Case	Degree of Collateral Circulation	Defect Closure Approach
1	Good	Conservative therapy
2	Good	ICA occlusion with a balloon at the site of injury
3	Good	ICA occlusion with a balloon at the site of injury
4	Nonsufficient	Stent-graft
5	Sufficient	ICA occlusion with microcoils at the site of injury + single extra-intracranial bypass (flow-supplementing surgery)
6	Good	No endovascular treatment needed
7	Good	ICA occlusion with microcoils at the site of injury
8	Nonsufficient	High-flow bypass (flow-substituting surgery) + ICA occlusion with microcoils at the site of injury.