"Pseudostring sign" on carotid computed tomographic angiography: collateralization by vasa vasorum.
We present 3 cases of unilateral internal carotid artery (ICA) occlusions with prominent single collateralizing vessel of vasa vasorum on computed tomographic angiography. The features on axial source and 3-dimensional images of computed tomographic angiography include "pseudostring sign," serpigenous course of the vasa vasorum, eccentric dot appearance in the wall of chronically thrombosed ICA, and termination in the neck or reconstituting into the ICA at or below the skull base.
Ahmed
Manzoor
M
Section of Neuroradiology, Cleveland Clinic Foundation, MRI, Cleveland, OH 44195, USA. Ahmedm2@ccf.org
Kang
Preet
P
Pinault
Gilles
G
Jean-Claude
Jessie
J
D000368:Aged; D002343:Carotid Artery, Internal / Q000000981:diagnostic imaging*; D016893:Carotid Stenosis / Q000000981:diagnostic imaging*; D002533:Cerebral Angiography / Q000379:methods*; D003097:Collateral Circulation; D006801:Humans; D008875:Middle Aged; D014057:Tomography, X-Ray Computed / Q000379:methods*; D014651:Vasa Vasorum / Q000000981:diagnostic imaging*