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Bilateral compression of the subclavian veins when the patient hyperabducts her arms, compression at the costoclavicular space, conditioned by the clavicle and the first rib.
In the left subclavian vein, there is echogenic material visualized with partial flow when seen with color Doppler, consistent with thrombus.
Right subclavian vein, with adequate flow, without compression when arm not elevated. Right subclavian vein compression in dynamic exploration (elevation of the arm)