A 42-year-old woman with external carotid-external jugular AVF. Axial contrast-enhanced CT shows the fistula (black arrow) between the left external carotid artery (short white arrow) and the left external jugular vein (long white arrow) with associated dilatation of these vessels. The left internal jugular vein (long dashed arrow) is incidentally hypoplastic, as compared with the normal right internal jugular vein (short dashed arrow).