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Figure 1. A 45-year-old woman with pulmonary hypertension and polycythemia presented with increasing cyanosis, edema of the legs, and dyspnea on exertion. She had a partial pressure of arterial oxygen of 35 mm Hg (pH, 7.35). The chest radiograph (lower left panel) showed an enlarged pulmonary artery, small peripheral vessels, and global cardiomegaly. Right posterior oblique (RPO) and left posterior oblique (LPO) perfusion scans showed medium-sized segmental defects in the posterior segment of the right upper lobe and the superior segments of both the right and left lower lobes (arrows in upper left and middle panels). These defects were . . . [Full Text of this Article] |
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