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Fig. 7 | BMC Neurology

Fig. 7

From: Four collateral circulation pathways were observed after common carotid artery occlusion

Fig. 7

CTA discovered a fourth collateral circulation pathway that supplied ipsilateral ICA after CCAO. CTA showed coexistence of several collateral circulation pathways in one patient. Pathway 1: ipsilateral vertebral artery – occipital artery (arrow ) – ECA – ICA. Pathway 2a: ipsilateral thyrocervical trunk – ascending cervical artery (arrow) – occipital artery – ECA – ICA. Pathway 2b: ipsilateral costocervical trunk – deep cervical artery (arrow ) – occipital artery – ECA – ICA. Pathway 4: ipsilateral thyrocervical trunk – inferior thyroid artery – superior thyroid artery (arrow ) – ECA – ICA

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