Table 1. Previous with Duplicated Origin of the Vertebral Artery since 1998.

Author (Year)	Sex	Age	Laterality	Image	Medial limb	Lateral limb	Union level	Disease or status
Ionete C. et al. (2006)	M	83	Right	MRA*	RSA	RSA	C4-5	Cognitive imparment
			Left		LSA	LSA	C5-6
Mordasini P. et al. (2008)	M	48	Right	MRA*	RSA	RSA	C4-5	Cerebral infarction
			Left		Aorta	LSA	C4-5
Rameshbabu. CS. et al. (2014)	M	36	Right	CTA#	RSA	RSA	C4-5	Dizziness
			Left		Aorta	LSA	C5-6
Goddard et al. (2001)	F	66	Right	MRA$	RSA	RSA	NA	Cerebral infarction
	M	49	Right	MRA$	NA	NA	NA	ICA occlusion
Satti SR. et al. (2007)	F	53	Right	DSA	RSA	RSA	C3	headache
Harnier et al (2008)	F	61	Right	MRA@	RSA	RSA	NA	Dizziness
Thomas AJ. et al. (2008)	F	49	Right	DSA	RSA	RSA	C6	Aneurysm
Melki et al. (2012)	M	51	Right	CTA, MRA	RSA	RSA	C5-6	Cerebellar infarction
Mahmutyazicioglu et al. (1998)	M	62	Left	US and CTA	LSA	LSA	NA	TIA
Satti SR. et al. (2007)	M	62	Left	DSA	Aorta	LSA	NA	Presyncope
Kim DW et al. (2009)	F	42	Left	DSA	Aorta	LSA	C5	AVF
Polguj et al. (2013)	M	43	Left	CTA	LSA	LSA	C5-6	ICA dissection
Shin SW et al. (2013)	F	51	Left	CTA, MRA and DSA	Aorta	LSA	C4	Aneurysm
Kendi ATK et al. (2014)	F	59	Left	CTA and MRA	Aorta	LSA	C5-6	Aneurysms
Our case	F	63	Left	DSA	Aorta	LSA	C4	Cerebellar infarction

^*3D contrast-enhanced magnetic resonance angiography (MRA) of the neck and transverse source image from the 2D time-of-flight (TOF) MRA, ^#Multidetector 64-row computed tomography (MDCT) angiography, ^$2D TOF MRA of the cervical vessels and 3D TOF MRA of the cervical and intracranial vessels, ^@maximum intensity projection (MIP)-reconstruction of a TOF MRA

Note: RSA, right subclavian artery; LSA, left subclavian artery; BCA, brachiocephalic artery; MRA, magnetic resonance angiography; CTA, computed tomography angiography; DSA, digital subtraction angiography; TIA, transient ischemic attack; NA, not assessable