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Figure 1: (a and b) The image shows DSA of the left common carotid artery. Compared to post-treatment, pretreatment DSA exhibits intracranial peripheral arteries that are narrow and takes longer for visualization than the occipital artery. The distal arteries of the maxillary artery are not clearly visualized. c and d) The region distal to the maxillary artery was magnified and imaged; the pretreatment image contrast is increased for easier visualization. The infraorbital and sphenopalatine arteries show spasm (red circled area) and contrast agent pooling in the capillary phase is not observed

Figure 1: (a and b)  The image shows DSA of the left common carotid artery. Compared to post-treatment, pretreatment DSA exhibits intracranial peripheral arteries that are narrow and takes longer for visualization than the occipital artery. The distal arteries of the maxillary artery are not clearly visualized. c and d) The region distal to the maxillary artery was magnified and imaged; the pretreatment image contrast is increased for easier visualization. The infraorbital and sphenopalatine arteries show spasm (red circled area) and contrast agent pooling in the capillary phase is not observed