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Figure 2: Preoperative intracranial vascular imaging. (a-d) Preoperative left internal carotid artery digital subtraction angiography (lateral view) demonstrating the development of fusiform dilatation of the left internal carotid artery cavernous segment (arrow). The outline of the vascular superior wall is continuous; however, the inferior wall blurs with iodinated contrast media retention, indicating that the tear is located in the anterior and posterior segment of the wall. (e) Preoperative left internal carotid artery digital subtraction angiography (frontal view) showing a dissecting aneurysm with iodinated contrast media retention in the aneurysm (arrow). (f) CT angiography of the head on initial presentation demonstrating fusiform dilatation toward the anterior and posterior direction at the cavernous segment of the left internal carotid artery (arrow)

Figure 2: Preoperative intracranial vascular imaging. (a-d) Preoperative left internal carotid artery digital subtraction angiography (lateral view) demonstrating the development of fusiform dilatation of the left internal carotid artery cavernous segment (arrow). The outline of the vascular superior wall is continuous; however, the inferior wall blurs with iodinated contrast media retention, indicating that the tear is located in the anterior and posterior segment of the wall. (e) Preoperative left internal carotid artery digital subtraction angiography (frontal view) showing a dissecting aneurysm with iodinated contrast media retention in the aneurysm (arrow). (f) CT angiography of the head on initial presentation demonstrating fusiform dilatation toward the anterior and posterior direction at the cavernous segment of the left internal carotid artery (arrow)