FIGURE 4.

Longitudinal ultrasound view of the right subclavian artery at the level of the pleurocupular region (A). Illustration of the same ultrasound image (B). The red lines show the subclavian artery with indentation (white arrow) through the pleurocupular ligament (white triangle). The blue line identifies the pleural apex. Caution should be given to a depressed or angulated subclavian artery without associated flow reduction. This is a frequently seen and unspecific finding and therefore should not be overdiagnosed.