Figure 2

Initial ultrasound findings. On figure 1A, the mainstem and one M2 segment of the left middle cerebral artery are depicted in colour mode using transcranial colour coded duplex sonography. Note the typical aliasing in the most proximal segment despite the rather insensitive setting of the colour scale, indicating a severely stenosed segment. On figure 1B, the Doppler spectogram as measured in that segment is given, indeed showing highly elevated blood flow velocities.