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Figure 2 Correlation between lung perfusion and cumulative stenosis index (CSI). Scatter diagram showing the negative correlation between the relative lung perfusion and the CSI. Patients are labeled by their symptom grade. All patients having severe symptoms (grade 3) had a CSI 75% and a relative perfusion of <25% (located in the lower right quadrant), whereas asymptomatic patients or those having mild symptoms (grade 0 and 1, respectively) had a CSI <75% and a relative perfusion >25% (located in the upper left quadrant). S. grade = symptom grade (0 = asymptomatic; 1 = mild symptoms; 2 = moderate; 3 = severe).