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Fig. 2A —Acute pulmonary embolism (PE) in 78-year-old woman (same patient as shown in Figs. 1A, 1B, 1C, 1D, and 1E). Left pulmonary angiogram shows central filling defect (arrow) within posterior segment of left upper lobe. In this patient, all three segmental arteries of left upper lobe arise directly from main pulmonary artery. Nonuniform arterial perfusion (arrowhead) is seen on arteriogram.