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Figure 4: Type A: A 40 year-old male with syncope, suspected of cerebrovascular accident (CVA): A single AcomA. The ICA bifurcates into the pre-communicating segment of the ACA and the MCA. Type B: A 48 year-old male with syncope, suspected of CVA: Two AcomAs (arrows). (c1 and 2) Type C: A 42-yearold male with transient unsteadiness, suspected of CVA: Medial artery of the corpus callosum arises (arrow) from the AcomA. (d1 and 2) Type D: A 36-year-old female with headache, for exclusion of vascular lesion: Focal fusion of the ACA (long arrow)

Figure 4: Type A: A 40 year-old male with syncope, suspected of cerebrovascular accident (CVA): A single AcomA. The ICA bifurcates into the pre-communicating segment of the ACA and the MCA. Type B: A 48 year-old male with syncope, suspected of CVA: Two AcomAs (arrows). (c1 and 2) Type C: A 42-yearold male with transient unsteadiness, suspected of CVA: Medial artery of the corpus callosum arises (arrow) from the AcomA. (d1 and 2) Type D: A 36-year-old female with headache, for exclusion of vascular lesion: Focal fusion of the ACA (long arrow)