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Fig. 3A —Acute pulmonary embolism in 55-year-old man. Right pulmonary artery angiogram shows large filling defect in right pulmonary artery (arrow). Nonuniform arterial perfusion is shown affecting majority of right lung with sparing of anterior segmental artery of right upper lobe. There is reflux of contrast material into left pulmonary artery. Unusual pulmonary artery catheter course due to azygos continuation of anomalous inferior vena cava is also seen.