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Fig. 5A. —73-year-old woman with chronic obstructive bronchopathy, acute exacerbation of dyspnea, and chest pain. Helical CT angiogram shows intraluminal filling defect of mediastinal superior lobar artery (arrow) and of left interlobar artery for which both observers made true-positive interpretation on helical CT angiography. Interpretations of ventilation—perfusion radionuclide lung scanning (not shown) were of intermediate probability (observer 1) and low probability (observer 2).

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