Figure 1

BPA-MRA images for a 24 year old male with history of right subclavian thrombosis referred for evaluation for TOS. Marked narrowing of the right subclavian vein is evident at abduction-late (solid arrow) with thrombus within the second part of the vein (open arrow). Narrowing resolves in adduction-late. Reversible narrowing of the left subclavian vein is also present (arrowhead).