Type C (Figure 1): The occlusion of the cervical ICA is at the common carotid artery bifurcation (the cervical ICA appears completely amputated at the bifurcation), and there is no ICA lumen observed. The common carotid artery continues as ECA. However, the cavernous and/or petrous segment is reconstituted by either collaterals from the ECA and/or retrograde filling from the supraclinoid segment. This type is thought to be technically difficult to revascularize using endovascular techniques.