DIAGNOSIS OF INTERNAL CAROTID PSEUDO-OCCLUSION BY USE OF COLOR-CODED DUPLEX SCANNING - A CASE-REPORT

The differentiation of ''pseudo'' from complete carotid artery occlusi on is still widely considered to be an indication for intraarterial an giography. The authors report a case in which color-coded duplex ultra sound revealed a persisting string-like lumen that was not adequately demonstrated by angiography. The duplex diagnosis of ''pseudo''-occlus ion requires the use of low-pulse repetition frequencies and in future may reduce the need for invasive imaging techniques. If angiography i s undertaken, even delayed films may fail to demonstrate the residual lumen adequately.