TABLE 1:

Previously published cases of extracranial internal carotid artery (ICA) fenestration or duplication

Type	Level	Comment	Reference
1. Duplication	Complete ICA	Aberrant ICA type	Killien et al., 1980
2. Fenestration	C2	Angiographic signs of dissection	Tanaka et al., 1982
3. Fenestration	C1–C2	Angiographic signs of dissection	Hasegawa et al., 1985
4. Fenestration	C1–C2	Angiographic signs of dissection	Hasegawa et al., 1985
5. Fenestration	C1–C2	Angiographic signs of dissection	Nakamura et al., 1993
6. Duplication	Complete ICA	Aberrant ICA type	Chess et al., 1995
7. Duplication	Complete ICA	Aberrant ICA type	Koenigsberg et al., 1995