Angiographic string sign

The angiographic string sign, also known as the carotid string sign, refers to the thin string of intravenous 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

  • preocclusive atherosclerosis at the carotid bifurcation
  • ICA dissection
  • ICA thrombosis
    • subacute partial
    • chronic subtotal
  • partial recanalization of an occluded ICA
  • stenosis secondary to radiation
Edit Article Share Article

Article Information

rID: 898
System: Vascular
Section: Signs
Tag: vascular
Synonyms or Alternate Spellings:
  • Carotid string sign
  • Drag
    Case 1: ICA string sign
    Drag here to reorder.
  • Updating… Please wait.


    Error Unable to process the form. Check for errors and try again.

    Alert_accept Thank you for updating your details.