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Figure 6: (a) Selective injection of the right common carotid artery shows tortuous collaterals (small thin black arrows) arising from the right external carotid artery. (b)The collaterals from the right external carotid artery are seen to supply the right subclavian artery distal to the occluded segment (thick black arrow) in the delayed phase

Figure 6: (a) Selective injection of the right common carotid artery shows tortuous collaterals (small thin black arrows) arising from the right external carotid artery. (b)The collaterals from the right external carotid artery are seen to supply the right subclavian artery distal to the occluded segment (thick black arrow) in the delayed phase