String sign (artery)
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The angiographic string sign, also known as the carotid string sign or slim sign, refers to the thin string of intravascular contrast material distal to a stenotic focus in the internal carotid artery (ICA).
A thin stripe of flow is caused by decreased pressure and flow distal to the stenosis, which causes a collapse of the distal ICA.
An angiographic string sign may be caused by:
pre-occlusive atherosclerosis at the carotid bifurcation
partial recanalization of an occluded ICA
stenosis secondary to radiation
- 1. Pappas JN. The angiographic string sign. Radiology 2002; 222(1):237-8. PubMed