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Figure 2 Chest roentgenograms showing the initial optimal position and subsequent distal migration of the Wallstents implanted in a hypoplastic left pulmonary artery (A and B). Note the change in position and shape of the proximal end of the stent before and after migration (arrow). In another patient with superior caval venous baffle stenosis, anterioposterior projection of radiography showing initial optimal position of the deployed stent for stenosed baffled limb (C). Note the relative position of the stent in relation to the vertebral border. Chest roentgenogram the next morning showed the stent had migrated, with significant alteration of its alignment and relative position to the vertebral border (D). Echocardiography demonstrated encroachment of the stent on the mitral valve.
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