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Screening ultrasound. The images display the bifurcation of the popliteal vein into the calf veins. The thrombus, marked with an asterisk (*), can be distinguished even without compression in the left vein (a). The left vein cannot be fully compressed, which is diagnostic of thrombosis, whereas the right vein demonstrates normal compression with full collapsibility (b). This pathological screening ultrasound was later confirmed by formal ultrasound
