Fig 6.

A 71-year-old woman with left-sided hemiparesis. A, Axial source CTA image shows opacification but decreased attenuation of the right supraclinoid ICA (large arrow) compared with the normal left side (small arrow). B, Axial reformatted MIP image again demonstrates overall decreased attenuation of the right supraclinoid ICA (large black arrow) compared with the normal left ICA and middle cerebral artery (MCA, small black arrows). A large filling defect is noted in the right MCA (white arrow). C, Angiogram, AP-view right carotid injection, shows an abrupt cutoff (black arrow) in the right MCA consistent with occlusion. No hemodynamically significant stenoses were observed at the origin or along the course of the right carotid artery to account for impaired blood flow and decreased arterial attenuation, which was instead attributed to the presence of a distal thrombus.