Fig. 4
From: Four collateral circulation pathways were observed after common carotid artery occlusion
DSA discovered a third collateral circulation pathway that supplied ipsilateral ICA after CCAO. This was a left (contralateral) CCA angiography (front position, arterial phase (a) and parenchymal phase (b)). Right CCA was occluded. The collateral circulation pathway was: left ECA – left superior thyroid artery – thyroid anastomosis (arrow①) – right superior thyroid artery – right ECA – right ICA (arrow②)