Fig. 15.

A 50-year-old woman with loss of consciousness. No measurable blood flow can be seen in the right internal carotid artery (RICA) on spectral (a) and colour (b) Doppler US. The external carotid (RECA) is patent. However, on CEUS (c) blood flow can be seen both in the RICA (arrow) and RECA (double arrow). Angiography performed later (not shown) detected more cephalad RICA dissection. In this case CEUS revealed poor, but present, blood flow in the RICA, which was not able to be detected by colour and spectral Doppler US, which suggested more caudal obstruction