1. Uchino A, Saito N, Watadani T, Okada Y, Kozawa E, Nishi N, Mizukoshi W, Inoue K, Nakajima R, Takahashi M. Vertebral artery variations at the C1-2 level diagnosed by magnetic resonance angiography. Neuroradiology. 2012;54:19–23.
2. Abe T, Kojima K, Singer RJ, Marks MP, Watanabe M, Ohtsuru K, Nishimura H, Hayabuchi N. Endovascular management of an aneurysm arising from posterior inferior cerebellar artery originated at the level of C2. Radiat Med. 1998;16:141–3.
3. Lin CF, Hsu SPC, Chen MT, Chen HH, Shih YH, Lee LS, Chen MH. Posterior inferior cerebellar artery with extracranial origin harboring an extracranial aneurysm. Surg Neurol. 2007;68(S1):64–7.
4. Fine AD, Cardoso A, Rhoton AL Jr. Microsurgical anatomy of the extracranial-extradural origin of the posterior inferior cerebellar artery. J Neurosurg. 1999;91:645–52.
5. Pasco A, Thouveny F, Papon X, Tanguy JY, Mercier P, Caron-Poitreau C, Herbreteau D. Ruptured aneurysm on a double origin of the posterior inferior cerebellar artery: a pathological entity in an anatomical variation. Report of two cases and review of the literature. J Neurosurg. 2002;96:127–31.