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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.
