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Figure 3 Correlation between timing of intervention and perfusion improvement. The scatter diagram shows the relation between the time from pulmonary vein occlusion diagnosis to the time of intervention and the improvement of the affected lung perfusion. Cases are labeled according to the degree of improvement of the cumulative stenosis index as detected by computed tomography scan. As shown, despite adequate restoration of vascular patency, later interventions were not associated with a significant improvement of perfusion. CT imp. = improvement of cumulative stenosis index by computed tomography.