MR examination of a patient suspected of having had a dissection of the right internal carotid artery. MR examination of a patient suspected of having had a dissection of the right internal carotid artery. (A) T1 weighted frequency selective fat saturated axial section showing the flow void in the true lumen and the subacute thrombus in the false lumen confirming the dissection. (B) Time of flight MRA of the runoff from the right common carotid artery showing the tapering irregular hyperintense lumen and the “ghost” of the thrombus in the false lumen around it. I Bone, and D M Hadley J Neurol Neurosurg Psychiatry 2005;76:iii29-iii38 ©2005 by BMJ Publishing Group Ltd